diff --git a/README.md b/README.md
new file mode 100644
index 0000000..5e61ba0
--- /dev/null
+++ b/README.md
@@ -0,0 +1,179 @@
+# Bookshelf
+
+A private, self-hosted home library app for two people. You scan the
+barcodes on your books; it looks up the metadata, stores it on your own
+server, and keeps both people's phones in sync. No cloud service, no public
+registration, no ads, no accounts you don't control.
+
+## The shared-library model
+
+Bookshelf is built for exactly one household: two people who both want to
+know what's on the shelves and where. There's no concept of "my books" vs.
+"your books" — every book belongs to the one shared library, and either
+person can scan, edit, move, or delete anything in it.
+
+- **Self-hosted.** You run a small [PocketBase](https://pocketbase.io/)
+  server on your own hardware (a NUC, an old laptop, a Raspberry Pi — see
+  [`server/deploy/`](server/deploy/)). Nobody else's data touches it, and it
+  touches nobody else's.
+- **Private by construction.** The server has no public sign-up
+  (`createRule = null` on the `users` collection in PocketBase — only a
+  superuser can create an account, via `server/create-user.sh`), and every
+  read/write to books, shelves, and bookcases requires a logged-in user.
+- **Two named accounts.** Create one account per person with
+  `server/create-user.sh`. That's the whole user model — there is no admin
+  UI, no roles, no invitations.
+
+## Architecture
+
+**Android app** (Kotlin, Jetpack Compose, Material 3) talking to a
+**PocketBase** backend over HTTPS.
+
+```
+app/     Android Gradle project (org.modg.bookshelf)
+server/  PocketBase schema, provisioning scripts, deploy docs
+docs/    SPEC.md — the authoritative product/technical spec this was built from
+```
+
+### Offline-first, Room-backed
+
+Every screen reads from a local [Room](https://developer.android.com/training/data-storage/room)
+database, never directly from the network — the app has to be fully usable
+(browse, search, edit notes, move books between shelves) with the home
+server unreachable, which residential NAT/dynamic IP setups make a routine
+occurrence, not an edge case. Every write lands in Room first and is
+synced to the server later; nothing blocks on network I/O, and a sync
+failure surfaces as a quiet status line, never a crash or a blocking dialog.
+
+Deletion is always a soft tombstone (`deleted = true`), never a hard delete,
+on both the client and the server — so a delete on one phone propagates to
+the other on next sync instead of just disappearing from one copy.
+
+### Sync: push-then-pull, last-write-wins
+
+Each sync cycle (on app start, pull-to-refresh, and a ~6-hourly WorkManager
+job) does two passes, in this order:
+
+1. **Push** every locally-changed record (tracked via a `syncState` column:
+   `PENDING_CREATE` / `PENDING_UPDATE` / `PENDING_DELETE`) to PocketBase.
+   New records use a client-generated 15-character id, sent as-is on create —
+   PocketBase accepts client-supplied ids, so an id never has to be remapped
+   after the fact. A `PENDING_DELETE` is pushed as a `PATCH {deleted: true}`,
+   never an actual record delete.
+2. **Pull** everything changed on the server since the last-seen cursor
+   (`updated > cursor`, paginated to exhaustion), so the two devices'
+   changes reconcile in one direction after the local push.
+
+**Conflict rule: last-write-wins on the server's `updated` timestamp.**
+If both phones edit the same book while offline, whichever write reaches
+the server later simply overwrites the earlier one — there is no merge, no
+per-field reconciliation, and no conflict UI. This is a deliberate
+simplification for a two-person household doing infrequent concurrent edits,
+not a limitation either of you should expect to fight with day-to-day, but
+it does mean a same-book edit race can silently lose one side's change.
+
+Book covers get the same treatment as everything else: the app downloads
+the cover from the metadata source and re-uploads it to PocketBase's own
+`cover` file field, so the household's library doesn't rot when an external
+cover URL eventually 404s. If offline, the cover is queued locally and
+uploaded on the next sync.
+
+### Metadata lookup
+
+Scanning a barcode looks the ISBN up against
+[Open Library](https://openlibrary.org/dev/docs/api/books), falling back to
+[Google Books](https://developers.google.com/books) if Open Library has
+nothing. The two results are merged (prefer whichever has a title; fill in
+blanks from the other); if both come up empty, the app offers manual entry
+pre-filled with the scanned ISBN instead of a dead end.
+
+## Building
+
+Requirements: JDK 21, Android SDK (compileSdk/targetSdk 37, build-tools
+37.0.0). No emulator is required or used in this project's own verification —
+see "Current limitations" below.
+
+```sh
+cd app
+./gradlew assembleDebug        # debug APK
+./gradlew testDebugUnitTest    # JVM unit tests (Robolectric + Paparazzi)
+./gradlew recordPaparazziDebug # re-record screenshot goldens under src/test/snapshots
+./gradlew assembleRelease      # release APK — see "Signing" below
+```
+
+### Signing a release build
+
+`app/app/build.gradle.kts` reads signing credentials from
+`app/keystore.properties` (gitignored, alongside the `.jks` keystore it
+points at) if that file exists:
+
+```properties
+storeFile=release-keystore.jks
+storePassword=...
+keyAlias=bookshelf
+keyPassword=...
+```
+
+Without that file, `assembleRelease` still succeeds — the release build type
+simply comes out unsigned (debug-signed by AGP's defaults), so anyone who
+clones this repo can build and run it without needing the household's actual
+release key. Only the machine(s) that own `keystore.properties` produce an
+APK you'd actually want to install permanently (Android treats a
+signing-key change as a different app for update purposes, so hang on to
+that keystore).
+
+## Deploying the server
+
+See [`server/README.md`](server/README.md) for the schema and provisioning
+scripts, and [`server/deploy/`](server/deploy/) for running PocketBase
+long-term (systemd or Docker), reaching it from outside your home network
+(Tailscale is the recommended option — no ports opened on your router, no
+TLS cert management), and backups. In short:
+
+```sh
+cd server
+./setup-schema.sh http://127.0.0.1:8090 <superuser-email> <superuser-password>
+./create-user.sh you@example.com "a strong password" "Your Name"
+./create-user.sh partner@example.com "a different strong password" "Partner Name"
+```
+
+Enter the server's URL (must be `https://`, unless it's Tailscale-only —
+see the deploy README) on the app's first-run setup screen; it's never
+hardcoded into the build.
+
+## Installing the APK
+
+Build (or ask whoever holds the release keystore to build)
+`app/app/build/outputs/apk/release/app-release.apk`, copy it to the phone,
+and open it. Android will prompt to allow installs from that source the
+first time. There's no Play Store listing — this app is not, and was never
+meant to be, publicly distributed.
+
+## Current limitations
+
+Read this before assuming more polish than exists:
+
+- **The app has never run on a physical device or emulator.** This
+  environment has no KVM, so there is no Android emulator available.
+  Everything here was verified via `./gradlew assembleDebug`,
+  `testDebugUnitTest` (JVM/Robolectric unit tests), and Paparazzi screenshot
+  rendering (`src/test/snapshots/images/`) — real logic paths (ISBN
+  checksums, metadata merging, sync conflict resolution, DAO queries) are
+  unit-tested, and every screen has been rendered to a static PNG in both
+  light and dark theme, but nothing has been tap-tested on an actual screen.
+  Camera/barcode scanning in particular has only been exercised through unit
+  tests of the pure logic (`IsbnBarcodeAnalyzer`/`ScanCodeFilter`), never a
+  live camera.
+- **Sync has been round-tripped against a real PocketBase exactly once**
+  (a live-server test covering auth, push with client-generated ids, pull,
+  last-write-wins, tombstones, and a byte-for-byte cover round-trip — see
+  `server/live-sync-test.sh`). It has not been exercised over an actual flaky
+  residential connection, nor with two devices genuinely racing each other.
+- **Conflict resolution is last-write-wins with no merge and no UI** for it,
+  as described above — acceptable for this app's scale, but worth knowing
+  before relying on it under real concurrent edits.
+- **No Room foreign keys** between books/shelves/bookcases (a deliberate
+  simplification) — an orphaned `shelfId` on a book is handled in queries,
+  not prevented by the schema.
+- **No automated instrumented/UI tests** — only JVM unit tests and Paparazzi
+  screenshots. There is no CI pipeline in this repo.
diff --git a/app/.gitignore b/app/.gitignore
index 698018d..ab6baee 100644
--- a/app/.gitignore
+++ b/app/.gitignore
@@ -10,3 +10,6 @@
 local.properties
 **/build/
 .kotlin/
+keystore.properties
+*.jks
+*.keystore
diff --git a/app/app/build.gradle.kts b/app/app/build.gradle.kts
index 38998ca..0554d24 100644
--- a/app/app/build.gradle.kts
+++ b/app/app/build.gradle.kts
@@ -1,3 +1,5 @@
+import java.util.Properties
+
 plugins {
     alias(libs.plugins.android.application)
     // NOTE: no org.jetbrains.kotlin.android plugin — AGP 9's Kotlin support is
@@ -8,6 +10,17 @@ plugins {
     alias(libs.plugins.paparazzi)
 }
 
+// Release signing is optional: `keystore.properties` (gitignored, alongside the
+// keystore it points at) only exists on machines that own the release key. Anyone
+// else still gets a working `assembleRelease` — it just comes out debug-signed.
+val keystorePropertiesFile = rootProject.file("keystore.properties")
+val keystoreProperties = Properties().apply {
+    if (keystorePropertiesFile.exists()) {
+        keystorePropertiesFile.inputStream().use { load(it) }
+    }
+}
+val hasReleaseKeystore = keystorePropertiesFile.exists()
+
 android {
     namespace = "org.modg.bookshelf"
     compileSdk = 37
@@ -23,10 +36,24 @@ android {
         testInstrumentationRunner = "androidx.test.runner.AndroidJUnitRunner"
     }
 
+    signingConfigs {
+        if (hasReleaseKeystore) {
+            create("release") {
+                storeFile = rootProject.file(keystoreProperties["storeFile"] as String)
+                storePassword = keystoreProperties["storePassword"] as String
+                keyAlias = keystoreProperties["keyAlias"] as String
+                keyPassword = keystoreProperties["keyPassword"] as String
+            }
+        }
+    }
+
     buildTypes {
         release {
             isMinifyEnabled = false
             proguardFiles(getDefaultProguardFile("proguard-android-optimize.txt"), "proguard-rules.pro")
+            if (hasReleaseKeystore) {
+                signingConfig = signingConfigs.getByName("release")
+            }
         }
     }
 
diff --git a/app/app/src/main/java/org/modg/bookshelf/data/prefs/SettingsStore.kt b/app/app/src/main/java/org/modg/bookshelf/data/prefs/SettingsStore.kt
index 4f802c4..b7a2817 100644
--- a/app/app/src/main/java/org/modg/bookshelf/data/prefs/SettingsStore.kt
+++ b/app/app/src/main/java/org/modg/bookshelf/data/prefs/SettingsStore.kt
@@ -24,6 +24,7 @@ class SettingsStore(private val context: Context) {
         val SERVER_URL = stringPreferencesKey("server_url")
         val AUTH_TOKEN = stringPreferencesKey("auth_token")
         val USER_ID = stringPreferencesKey("user_id")
+        val USER_EMAIL = stringPreferencesKey("user_email")
         val LAST_SYNC_TIME = longPreferencesKey("last_sync_time")
         fun cursor(collection: String) = stringPreferencesKey("cursor_$collection")
     }
@@ -31,6 +32,7 @@ class SettingsStore(private val context: Context) {
     val serverUrl: Flow<String?> = context.dataStore.data.map { it[Keys.SERVER_URL] }
     val authToken: Flow<String?> = context.dataStore.data.map { it[Keys.AUTH_TOKEN] }
     val userId: Flow<String?> = context.dataStore.data.map { it[Keys.USER_ID] }
+    val userEmail: Flow<String?> = context.dataStore.data.map { it[Keys.USER_EMAIL] }
     val lastSyncTime: Flow<Long?> = context.dataStore.data.map { it[Keys.LAST_SYNC_TIME] }
 
     fun cursorFor(collection: String): Flow<String?> =
@@ -48,6 +50,10 @@ class SettingsStore(private val context: Context) {
         context.dataStore.edit { it[Keys.USER_ID] = userId }
     }
 
+    suspend fun setUserEmail(email: String) {
+        context.dataStore.edit { it[Keys.USER_EMAIL] = email }
+    }
+
     suspend fun setCursor(collection: String, cursor: String) {
         context.dataStore.edit { it[Keys.cursor(collection)] = cursor }
     }
@@ -61,6 +67,7 @@ class SettingsStore(private val context: Context) {
         context.dataStore.edit {
             it.remove(Keys.AUTH_TOKEN)
             it.remove(Keys.USER_ID)
+            it.remove(Keys.USER_EMAIL)
         }
     }
 
diff --git a/app/app/src/main/java/org/modg/bookshelf/data/repo/AuthRepository.kt b/app/app/src/main/java/org/modg/bookshelf/data/repo/AuthRepository.kt
index 4c2b74d..366c33c 100644
--- a/app/app/src/main/java/org/modg/bookshelf/data/repo/AuthRepository.kt
+++ b/app/app/src/main/java/org/modg/bookshelf/data/repo/AuthRepository.kt
@@ -35,6 +35,7 @@ class AuthRepository(
             val response = api.authWithPassword(AuthWithPasswordRequest(identity = email, password = password))
             settingsStore.setAuthToken(response.token)
             settingsStore.setUserId(response.record.id)
+            settingsStore.setUserEmail(email)
             Result.success(Unit)
         } catch (e: Exception) {
             Result.failure(e)
diff --git a/app/app/src/main/java/org/modg/bookshelf/ui/settings/SettingsScreen.kt b/app/app/src/main/java/org/modg/bookshelf/ui/settings/SettingsScreen.kt
index ac068ac..17607d3 100644
--- a/app/app/src/main/java/org/modg/bookshelf/ui/settings/SettingsScreen.kt
+++ b/app/app/src/main/java/org/modg/bookshelf/ui/settings/SettingsScreen.kt
@@ -76,7 +76,7 @@ fun SettingsScreen(
                 GoldDivider(modifier = Modifier.padding(vertical = 16.dp))
 
                 SectionHeading("Account")
-                InfoRow(label = "Signed in as", value = state.userId ?: "Unknown")
+                InfoRow(label = "Signed in as", value = state.userEmail ?: "Unknown")
                 SecondaryButton(
                     text = "Sign out",
                     onClick = { confirmSignOut = true },
diff --git a/app/app/src/main/java/org/modg/bookshelf/ui/settings/SettingsViewModel.kt b/app/app/src/main/java/org/modg/bookshelf/ui/settings/SettingsViewModel.kt
index c8144ec..6d6d2e1 100644
--- a/app/app/src/main/java/org/modg/bookshelf/ui/settings/SettingsViewModel.kt
+++ b/app/app/src/main/java/org/modg/bookshelf/ui/settings/SettingsViewModel.kt
@@ -17,7 +17,7 @@ import org.modg.bookshelf.ui.components.SyncStatus
 
 data class SettingsUiState(
     val serverUrl: String? = null,
-    val userId: String? = null,
+    val userEmail: String? = null,
     val bookCount: Int = 0,
     val coverCount: Int = 0,
     val lastSyncTime: Long? = null,
@@ -35,7 +35,7 @@ data class SettingsUiState(
 
 private data class BaseInfo(
     val serverUrl: String?,
-    val userId: String?,
+    val userEmail: String?,
     val bookCount: Int,
     val coverCount: Int,
     val lastSyncTime: Long?,
@@ -54,13 +54,13 @@ class SettingsViewModel(
 
     private val baseInfo = combine(
         authRepository.serverUrl,
-        settingsStore.userId,
+        settingsStore.userEmail,
         bookRepository.observeAll(),
         settingsStore.lastSyncTime,
-    ) { url, userId, books, lastSync ->
+    ) { url, userEmail, books, lastSync ->
         BaseInfo(
             serverUrl = url,
-            userId = userId,
+            userEmail = userEmail,
             bookCount = books.size,
             coverCount = books.count { !it.coverUrl.isNullOrBlank() || !it.localCoverPath.isNullOrBlank() },
             lastSyncTime = lastSync,
@@ -70,7 +70,7 @@ class SettingsViewModel(
     val uiState: StateFlow<SettingsUiState> = combine(baseInfo, isSyncing, syncError) { base, syncing, error ->
         SettingsUiState(
             serverUrl = base.serverUrl,
-            userId = base.userId,
+            userEmail = base.userEmail,
             bookCount = base.bookCount,
             coverCount = base.coverCount,
             lastSyncTime = base.lastSyncTime,
diff --git a/app/app/src/test/java/org/modg/bookshelf/data/repo/AuthRepositoryTest.kt b/app/app/src/test/java/org/modg/bookshelf/data/repo/AuthRepositoryTest.kt
new file mode 100644
index 0000000..b16eebd
--- /dev/null
+++ b/app/app/src/test/java/org/modg/bookshelf/data/repo/AuthRepositoryTest.kt
@@ -0,0 +1,52 @@
+package org.modg.bookshelf.data.repo
+
+import androidx.test.core.app.ApplicationProvider
+import kotlinx.coroutines.flow.first
+import kotlinx.coroutines.test.runTest
+import org.junit.Assert.assertEquals
+import org.junit.Assert.assertNull
+import org.junit.Assert.assertTrue
+import org.junit.Before
+import org.junit.Test
+import org.junit.runner.RunWith
+import org.modg.bookshelf.data.prefs.SettingsStore
+import org.modg.bookshelf.data.remote.PocketBaseApi
+import org.robolectric.RobolectricTestRunner
+import org.robolectric.annotation.Config
+
+/**
+ * Covers the settings-email gap from the wave-4 handoff: Settings used to show the
+ * PocketBase user id because login never persisted the entered email.
+ */
+@RunWith(RobolectricTestRunner::class)
+@Config(sdk = [34])
+class AuthRepositoryTest {
+
+    private lateinit var settingsStore: SettingsStore
+    private lateinit var api: FakePocketBaseApi
+    private lateinit var repository: AuthRepository
+
+    @Before
+    fun setUp() {
+        settingsStore = SettingsStore(ApplicationProvider.getApplicationContext())
+        api = FakePocketBaseApi()
+        repository = AuthRepository(apiProvider = { api as PocketBaseApi }, settingsStore = settingsStore)
+    }
+
+    @Test
+    fun `login persists the entered email so Settings can show it`() = runTest {
+        val result = repository.login(email = "reader@example.com", password = "hunter2")
+
+        assertTrue(result.isSuccess)
+        assertEquals("reader@example.com", settingsStore.userEmail.first())
+    }
+
+    @Test
+    fun `sign out clears the persisted email`() = runTest {
+        repository.login(email = "reader@example.com", password = "hunter2")
+
+        repository.signOut()
+
+        assertNull(settingsStore.userEmail.first())
+    }
+}
diff --git a/app/app/src/test/java/org/modg/bookshelf/ui/screens/DetailScreenPaparazziTest.kt b/app/app/src/test/java/org/modg/bookshelf/ui/screens/DetailScreenPaparazziTest.kt
new file mode 100644
index 0000000..500d674
--- /dev/null
+++ b/app/app/src/test/java/org/modg/bookshelf/ui/screens/DetailScreenPaparazziTest.kt
@@ -0,0 +1,92 @@
+package org.modg.bookshelf.ui.screens
+
+import androidx.compose.foundation.layout.Column
+import androidx.compose.foundation.layout.fillMaxSize
+import androidx.compose.foundation.layout.padding
+import androidx.compose.foundation.rememberScrollState
+import androidx.compose.foundation.verticalScroll
+import androidx.compose.material.icons.Icons
+import androidx.compose.material.icons.automirrored.outlined.ArrowBack
+import androidx.compose.material.icons.outlined.Delete
+import androidx.compose.material.icons.outlined.Edit
+import androidx.compose.material3.Icon
+import androidx.compose.material3.IconButton
+import androidx.compose.runtime.Composable
+import androidx.compose.ui.Modifier
+import androidx.compose.ui.unit.dp
+import app.cash.paparazzi.DeviceConfig
+import app.cash.paparazzi.Paparazzi
+import org.junit.Rule
+import org.junit.Test
+import org.modg.bookshelf.ui.components.BookshelfScaffold
+import org.modg.bookshelf.ui.components.GoldDivider
+import org.modg.bookshelf.ui.components.PaperSurface
+import org.modg.bookshelf.ui.detail.BookHeader
+import org.modg.bookshelf.ui.detail.DescriptionSection
+import org.modg.bookshelf.ui.detail.LocationSection
+import org.modg.bookshelf.ui.detail.NotesSection
+import org.modg.bookshelf.ui.theme.BookshelfTheme
+
+/**
+ * SPEC.md "detail" screen — big cover, metadata, collapsible description,
+ * editable notes, location picker. Rebuilds [org.modg.bookshelf.ui.detail.DetailScreen]'s
+ * shell around its own real internal sections ([BookHeader], [DescriptionSection],
+ * [NotesSection], [LocationSection]) with [ScreenFixtures.detailBook], per the
+ * pattern in [ScreenFixtures].
+ */
+class DetailScreenPaparazziTest {
+
+    @get:Rule
+    val paparazzi = Paparazzi(deviceConfig = DeviceConfig.PIXEL_6)
+
+    @Test
+    fun detailPopulatedLight() = snapshotBoth("detail-populated") { Populated() }
+
+    @Composable
+    private fun Populated() = Shell()
+
+    @Composable
+    private fun Shell() {
+        val book = ScreenFixtures.detailBook
+        BookshelfScaffold(
+            title = book.title,
+            navigationIcon = {
+                IconButton(onClick = {}) { Icon(Icons.AutoMirrored.Outlined.ArrowBack, contentDescription = "Back") }
+            },
+            actions = {
+                IconButton(onClick = {}) { Icon(Icons.Outlined.Edit, contentDescription = "Edit") }
+                IconButton(onClick = {}) { Icon(Icons.Outlined.Delete, contentDescription = "Delete") }
+            },
+        ) { innerPadding ->
+            PaperSurface(modifier = Modifier.fillMaxSize()) {
+                Column(
+                    modifier = Modifier
+                        .padding(innerPadding)
+                        .fillMaxSize()
+                        .verticalScroll(rememberScrollState())
+                        .padding(16.dp),
+                ) {
+                    BookHeader(book = book)
+                    GoldDivider(modifier = Modifier.padding(vertical = 16.dp))
+                    DescriptionSection(description = book.description)
+
+                    GoldDivider(modifier = Modifier.padding(vertical = 16.dp))
+                    NotesSection(book = book, onSave = {})
+
+                    GoldDivider(modifier = Modifier.padding(vertical = 16.dp))
+                    LocationSection(
+                        book = book,
+                        bookcases = ScreenFixtures.bookcases,
+                        shelves = ScreenFixtures.shelves,
+                        onShelfSelected = {},
+                    )
+                }
+            }
+        }
+    }
+
+    private fun snapshotBoth(name: String, content: @Composable () -> Unit) {
+        paparazzi.snapshot(name = "$name-light") { BookshelfTheme(darkTheme = false) { content() } }
+        paparazzi.snapshot(name = "$name-dark") { BookshelfTheme(darkTheme = true) { content() } }
+    }
+}
diff --git a/app/app/src/test/java/org/modg/bookshelf/ui/screens/LocationsScreenPaparazziTest.kt b/app/app/src/test/java/org/modg/bookshelf/ui/screens/LocationsScreenPaparazziTest.kt
new file mode 100644
index 0000000..b5ec1b0
--- /dev/null
+++ b/app/app/src/test/java/org/modg/bookshelf/ui/screens/LocationsScreenPaparazziTest.kt
@@ -0,0 +1,94 @@
+package org.modg.bookshelf.ui.screens
+
+import androidx.compose.foundation.layout.PaddingValues
+import androidx.compose.foundation.layout.fillMaxWidth
+import androidx.compose.foundation.lazy.LazyColumn
+import androidx.compose.foundation.lazy.items
+import androidx.compose.foundation.layout.padding
+import androidx.compose.material.icons.Icons
+import androidx.compose.material.icons.filled.Add
+import androidx.compose.material.icons.filled.ArrowBack
+import androidx.compose.material3.FloatingActionButton
+import androidx.compose.material3.Icon
+import androidx.compose.material3.IconButton
+import androidx.compose.runtime.Composable
+import androidx.compose.ui.Modifier
+import androidx.compose.ui.unit.dp
+import app.cash.paparazzi.DeviceConfig
+import app.cash.paparazzi.Paparazzi
+import org.junit.Rule
+import org.junit.Test
+import org.modg.bookshelf.ui.components.BookshelfScaffold
+import org.modg.bookshelf.ui.components.GoldDivider
+import org.modg.bookshelf.ui.components.PaperSurface
+import org.modg.bookshelf.ui.locations.BookcaseRow
+import org.modg.bookshelf.ui.locations.BookcaseUi
+import org.modg.bookshelf.ui.locations.ShelfUi
+import org.modg.bookshelf.ui.theme.BookshelfTheme
+
+/**
+ * SPEC.md "locations" screen — bookcases -> shelves tree with per-shelf book
+ * counts. Rebuilds [org.modg.bookshelf.ui.locations.LocationsScreen]'s shell
+ * around its own real [BookcaseRow] (which nests the real `ShelfRow`), fed
+ * counts derived from [ScreenFixtures.books], per the pattern in [ScreenFixtures].
+ */
+class LocationsScreenPaparazziTest {
+
+    @get:Rule
+    val paparazzi = Paparazzi(deviceConfig = DeviceConfig.PIXEL_6)
+
+    @Test
+    fun locationsPopulatedLight() = snapshotBoth("locations-populated") { Populated() }
+
+    @Composable
+    private fun Populated() = Shell()
+
+    @Composable
+    private fun Shell() {
+        val bookcaseUis = ScreenFixtures.bookcases.map { bookcase ->
+            BookcaseUi(
+                bookcase = bookcase,
+                shelves = ScreenFixtures.shelves
+                    .filter { it.bookcaseId == bookcase.id }
+                    .map { shelf -> ShelfUi(shelf, ScreenFixtures.books.count { it.shelfId == shelf.id }) },
+            )
+        }
+
+        BookshelfScaffold(
+            title = "Locations",
+            navigationIcon = {
+                IconButton(onClick = {}) { Icon(Icons.Filled.ArrowBack, contentDescription = "Back") }
+            },
+            floatingActionButton = {
+                FloatingActionButton(onClick = {}) { Icon(Icons.Filled.Add, contentDescription = "Add bookcase") }
+            },
+        ) { innerPadding ->
+            PaperSurface(modifier = Modifier.fillMaxWidth()) {
+                LazyColumn(contentPadding = PaddingValues(top = innerPadding.calculateTopPadding(), bottom = 96.dp)) {
+                    items(bookcaseUis, key = { it.bookcase.id }) { bookcaseUi ->
+                        BookcaseRow(
+                            bookcaseUi = bookcaseUi,
+                            onEdit = {},
+                            onDelete = {},
+                            onMoveUp = {},
+                            onMoveDown = {},
+                            onAddShelf = {},
+                            onShelfClick = {},
+                            onEditShelf = {},
+                            onDeleteShelf = {},
+                            onMoveShelfBooks = {},
+                            onShelfMoveUp = {},
+                            onShelfMoveDown = {},
+                        )
+                        GoldDivider(modifier = Modifier.padding(vertical = 4.dp))
+                    }
+                }
+            }
+        }
+    }
+
+    private fun snapshotBoth(name: String, content: @Composable () -> Unit) {
+        paparazzi.snapshot(name = "$name-light") { BookshelfTheme(darkTheme = false) { content() } }
+        paparazzi.snapshot(name = "$name-dark") { BookshelfTheme(darkTheme = true) { content() } }
+    }
+}
diff --git a/app/app/src/test/java/org/modg/bookshelf/ui/screens/ScanScreenPaparazziTest.kt b/app/app/src/test/java/org/modg/bookshelf/ui/screens/ScanScreenPaparazziTest.kt
new file mode 100644
index 0000000..76270b3
--- /dev/null
+++ b/app/app/src/test/java/org/modg/bookshelf/ui/screens/ScanScreenPaparazziTest.kt
@@ -0,0 +1,120 @@
+package org.modg.bookshelf.ui.screens
+
+import androidx.compose.foundation.background
+import androidx.compose.foundation.layout.Box
+import androidx.compose.foundation.layout.fillMaxSize
+import androidx.compose.foundation.layout.fillMaxWidth
+import androidx.compose.foundation.layout.padding
+import androidx.compose.foundation.shape.RoundedCornerShape
+import androidx.compose.material.icons.Icons
+import androidx.compose.material.icons.automirrored.outlined.ArrowBack
+import androidx.compose.material.icons.outlined.FlashOff
+import androidx.compose.material.icons.outlined.Keyboard
+import androidx.compose.material3.Icon
+import androidx.compose.material3.IconButton
+import androidx.compose.material3.MaterialTheme
+import androidx.compose.material3.Surface
+import androidx.compose.runtime.Composable
+import androidx.compose.ui.Alignment
+import androidx.compose.ui.Modifier
+import androidx.compose.ui.graphics.Color
+import androidx.compose.ui.unit.dp
+import app.cash.paparazzi.DeviceConfig
+import app.cash.paparazzi.Paparazzi
+import org.junit.Rule
+import org.junit.Test
+import org.modg.bookshelf.data.metadata.BookMetadata
+import org.modg.bookshelf.ui.components.BookshelfScaffold
+import org.modg.bookshelf.ui.scan.DuplicateStatus
+import org.modg.bookshelf.ui.scan.FoundBookSheet
+import org.modg.bookshelf.ui.scan.ScanReticle
+import org.modg.bookshelf.ui.scan.SessionBadge
+import org.modg.bookshelf.ui.theme.BookshelfTheme
+
+/**
+ * SPEC.md "scan" screen — camera + reticle, on-hit bottom sheet.
+ *
+ * Paparazzi has no real camera: [org.modg.bookshelf.ui.scan.ScanScreen]'s
+ * `CameraPreview` binds a live `ProcessCameraProvider`/`PreviewView`, which
+ * cannot run headless (same class of problem [ScreenFixtures] documents for
+ * Room/OkHttp). So this renders the screen's real overlay pieces — [ScanReticle],
+ * [SessionBadge], and the real [FoundBookSheet] — over a plain dark backdrop
+ * standing in for the live viewfinder, per the wave-4 task instructions.
+ */
+class ScanScreenPaparazziTest {
+
+    @get:Rule
+    val paparazzi = Paparazzi(deviceConfig = DeviceConfig.PIXEL_6)
+
+    @Test
+    fun scanReticleLight() = snapshotBoth("scan-reticle") { ReticleOverlay() }
+
+    @Test
+    fun scanFoundSheetLight() = snapshotBoth("scan-found-sheet") { FoundSheetOverlay() }
+
+    @Composable
+    private fun ReticleOverlay() = Shell {
+        Box(modifier = Modifier.fillMaxSize(), contentAlignment = Alignment.Center) {
+            ScanReticle(modifier = Modifier.align(Alignment.Center))
+            SessionBadge(count = 3, modifier = Modifier.align(Alignment.TopCenter).padding(16.dp))
+        }
+    }
+
+    @Composable
+    private fun FoundSheetOverlay() = Shell {
+        Box(modifier = Modifier.fillMaxSize()) {
+            Surface(
+                modifier = Modifier.align(Alignment.BottomCenter).fillMaxWidth(),
+                shape = RoundedCornerShape(topStart = 16.dp, topEnd = 16.dp),
+                color = MaterialTheme.colorScheme.surface,
+            ) {
+                FoundBookSheet(
+                    metadata = BookMetadata(
+                        isbn13 = "9780765326355",
+                        title = "The Way of Kings",
+                        authors = listOf("Brandon Sanderson"),
+                        publisher = "Tor",
+                        publishedDate = "2010",
+                        pageCount = 1007,
+                    ),
+                    duplicate = DuplicateStatus.New,
+                    bookcases = ScreenFixtures.bookcases,
+                    shelves = ScreenFixtures.shelves,
+                    selectedShelfId = ScreenFixtures.deskShelf.id,
+                    onShelfSelected = {},
+                    onSave = {},
+                    onSkip = {},
+                )
+            }
+        }
+    }
+
+    @Composable
+    private fun Shell(overlay: @Composable () -> Unit) {
+        BookshelfScaffold(
+            title = "Scan",
+            navigationIcon = {
+                IconButton(onClick = {}) { Icon(Icons.AutoMirrored.Outlined.ArrowBack, contentDescription = "Back") }
+            },
+            actions = {
+                IconButton(onClick = {}) { Icon(Icons.Outlined.FlashOff, contentDescription = "Toggle flashlight") }
+                IconButton(onClick = {}) { Icon(Icons.Outlined.Keyboard, contentDescription = "Enter ISBN manually") }
+            },
+        ) { innerPadding ->
+            Box(
+                modifier = Modifier
+                    .padding(innerPadding)
+                    .fillMaxSize()
+                    // Static stand-in for the live CameraX viewfinder — see class doc.
+                    .background(Color(0xFF1A1A1A)),
+            ) {
+                overlay()
+            }
+        }
+    }
+
+    private fun snapshotBoth(name: String, content: @Composable () -> Unit) {
+        paparazzi.snapshot(name = "$name-light") { BookshelfTheme(darkTheme = false) { content() } }
+        paparazzi.snapshot(name = "$name-dark") { BookshelfTheme(darkTheme = true) { content() } }
+    }
+}
diff --git a/app/app/src/test/java/org/modg/bookshelf/ui/screens/SettingsScreenPaparazziTest.kt b/app/app/src/test/java/org/modg/bookshelf/ui/screens/SettingsScreenPaparazziTest.kt
new file mode 100644
index 0000000..354d178
--- /dev/null
+++ b/app/app/src/test/java/org/modg/bookshelf/ui/screens/SettingsScreenPaparazziTest.kt
@@ -0,0 +1,89 @@
+package org.modg.bookshelf.ui.screens
+
+import androidx.compose.foundation.layout.Column
+import androidx.compose.foundation.layout.fillMaxWidth
+import androidx.compose.foundation.layout.padding
+import androidx.compose.material.icons.Icons
+import androidx.compose.material.icons.filled.ArrowBack
+import androidx.compose.material3.Icon
+import androidx.compose.material3.IconButton
+import androidx.compose.runtime.Composable
+import androidx.compose.ui.Modifier
+import androidx.compose.ui.unit.dp
+import app.cash.paparazzi.DeviceConfig
+import app.cash.paparazzi.Paparazzi
+import org.junit.Rule
+import org.junit.Test
+import org.modg.bookshelf.ui.components.BookshelfScaffold
+import org.modg.bookshelf.ui.components.GoldDivider
+import org.modg.bookshelf.ui.components.PaperSurface
+import org.modg.bookshelf.ui.components.PrimaryButton
+import org.modg.bookshelf.ui.components.SecondaryButton
+import org.modg.bookshelf.ui.components.SyncStatus
+import org.modg.bookshelf.ui.components.SyncStatusBar
+import org.modg.bookshelf.ui.settings.InfoRow
+import org.modg.bookshelf.ui.settings.SectionHeading
+import org.modg.bookshelf.ui.settings.formatLastSync
+import org.modg.bookshelf.ui.theme.BookshelfTheme
+
+/**
+ * SPEC.md "settings" screen — server, account (now showing the signed-in
+ * email per the wave-4 fix), sync status, book/cover counts. Rebuilds
+ * [org.modg.bookshelf.ui.settings.SettingsScreen]'s shell around its own real
+ * [SectionHeading]/[InfoRow]/[formatLastSync], per the pattern in [ScreenFixtures].
+ */
+class SettingsScreenPaparazziTest {
+
+    @get:Rule
+    val paparazzi = Paparazzi(deviceConfig = DeviceConfig.PIXEL_6)
+
+    @Test
+    fun settingsPopulatedLight() = snapshotBoth("settings-populated") { Populated() }
+
+    @Composable
+    private fun Populated() = Shell()
+
+    @Composable
+    private fun Shell() {
+        val lastSync = System.currentTimeMillis() - 2 * 60 * 1000L
+        BookshelfScaffold(
+            title = "Settings",
+            navigationIcon = {
+                IconButton(onClick = {}) { Icon(Icons.Filled.ArrowBack, contentDescription = "Back") }
+            },
+            syncStatusBar = {
+                SyncStatusBar(status = SyncStatus.Synced, label = "Synced • ${formatLastSync(lastSync)}")
+            },
+        ) { innerPadding ->
+            PaperSurface(modifier = Modifier.fillMaxWidth()) {
+                Column(modifier = Modifier.padding(innerPadding).padding(16.dp)) {
+                    SectionHeading("Server")
+                    InfoRow(label = "URL", value = "https://library.montanaro.home")
+
+                    GoldDivider(modifier = Modifier.padding(vertical = 16.dp))
+
+                    SectionHeading("Account")
+                    InfoRow(label = "Signed in as", value = "reader@example.com")
+                    SecondaryButton(text = "Sign out", onClick = {}, modifier = Modifier.padding(top = 8.dp))
+
+                    GoldDivider(modifier = Modifier.padding(vertical = 16.dp))
+
+                    SectionHeading("Sync")
+                    InfoRow(label = "Last synced", value = formatLastSync(lastSync))
+                    PrimaryButton(text = "Sync now", onClick = {}, modifier = Modifier.padding(top = 8.dp))
+
+                    GoldDivider(modifier = Modifier.padding(vertical = 16.dp))
+
+                    SectionHeading("Library")
+                    InfoRow(label = "Books", value = ScreenFixtures.books.size.toString())
+                    InfoRow(label = "Covers", value = "0")
+                }
+            }
+        }
+    }
+
+    private fun snapshotBoth(name: String, content: @Composable () -> Unit) {
+        paparazzi.snapshot(name = "$name-light") { BookshelfTheme(darkTheme = false) { content() } }
+        paparazzi.snapshot(name = "$name-dark") { BookshelfTheme(darkTheme = true) { content() } }
+    }
+}
diff --git a/app/app/src/test/java/org/modg/bookshelf/ui/screens/SetupScreenPaparazziTest.kt b/app/app/src/test/java/org/modg/bookshelf/ui/screens/SetupScreenPaparazziTest.kt
new file mode 100644
index 0000000..bb1f0a3
--- /dev/null
+++ b/app/app/src/test/java/org/modg/bookshelf/ui/screens/SetupScreenPaparazziTest.kt
@@ -0,0 +1,140 @@
+package org.modg.bookshelf.ui.screens
+
+import androidx.compose.foundation.layout.Arrangement
+import androidx.compose.foundation.layout.Column
+import androidx.compose.foundation.layout.fillMaxSize
+import androidx.compose.foundation.layout.fillMaxWidth
+import androidx.compose.foundation.layout.padding
+import androidx.compose.foundation.rememberScrollState
+import androidx.compose.foundation.text.KeyboardOptions
+import androidx.compose.foundation.verticalScroll
+import androidx.compose.material3.MaterialTheme
+import androidx.compose.material3.OutlinedTextField
+import androidx.compose.material3.Text
+import androidx.compose.runtime.Composable
+import androidx.compose.ui.Modifier
+import androidx.compose.ui.text.input.KeyboardType
+import androidx.compose.ui.text.input.PasswordVisualTransformation
+import androidx.compose.ui.unit.dp
+import app.cash.paparazzi.DeviceConfig
+import app.cash.paparazzi.Paparazzi
+import org.junit.Rule
+import org.junit.Test
+import org.modg.bookshelf.ui.components.GoldDivider
+import org.modg.bookshelf.ui.components.PaperSurface
+import org.modg.bookshelf.ui.components.PrimaryButton
+import org.modg.bookshelf.ui.theme.BookshelfTheme
+
+/**
+ * SPEC.md "setup" screen — first run, server URL + email + password.
+ * [org.modg.bookshelf.ui.setup.SetupScreen] wires everything straight to
+ * [org.modg.bookshelf.ui.setup.SetupViewModel] with no internal presentational
+ * split, so per [ScreenFixtures]'s established approach this rebuilds the same
+ * layout inline with plain, filled-in state instead of driving a real
+ * ViewModel (whose reachability probe builds an OkHttpClient — see
+ * [ScreenFixtures] for why that blows up under Paparazzi).
+ */
+class SetupScreenPaparazziTest {
+
+    @get:Rule
+    val paparazzi = Paparazzi(deviceConfig = DeviceConfig.PIXEL_6)
+
+    @Test
+    fun setupFilledLight() = snapshotBoth("setup-filled") { Filled() }
+
+    @Composable
+    private fun Filled() = Shell(
+        serverUrl = "https://library.montanaro.home",
+        email = "reader@example.com",
+        password = "hunter2",
+        urlError = null,
+        credentialsError = null,
+    )
+
+    @Composable
+    private fun Shell(
+        serverUrl: String,
+        email: String,
+        password: String,
+        urlError: String?,
+        credentialsError: String?,
+    ) {
+        PaperSurface(modifier = Modifier.fillMaxSize()) {
+            Column(
+                modifier = Modifier
+                    .fillMaxSize()
+                    .verticalScroll(rememberScrollState())
+                    .padding(24.dp),
+                verticalArrangement = Arrangement.Center,
+            ) {
+                Text(text = "Bookshelf", style = MaterialTheme.typography.displaySmall)
+                Text(
+                    text = "Connect to your home library server to get started.",
+                    style = MaterialTheme.typography.bodyMedium,
+                    color = MaterialTheme.colorScheme.onSurfaceVariant,
+                    modifier = Modifier.padding(top = 8.dp, bottom = 24.dp),
+                )
+
+                OutlinedTextField(
+                    value = serverUrl,
+                    onValueChange = {},
+                    label = { Text("Server URL") },
+                    placeholder = { Text("https://library.example.com") },
+                    singleLine = true,
+                    keyboardOptions = KeyboardOptions(keyboardType = KeyboardType.Uri),
+                    isError = urlError != null,
+                    modifier = Modifier.fillMaxWidth(),
+                )
+                if (urlError != null) {
+                    Text(
+                        text = urlError,
+                        style = MaterialTheme.typography.bodySmall,
+                        color = MaterialTheme.colorScheme.error,
+                        modifier = Modifier.padding(top = 4.dp),
+                    )
+                }
+
+                GoldDivider(modifier = Modifier.padding(vertical = 16.dp))
+
+                OutlinedTextField(
+                    value = email,
+                    onValueChange = {},
+                    label = { Text("Email") },
+                    singleLine = true,
+                    keyboardOptions = KeyboardOptions(keyboardType = KeyboardType.Email),
+                    isError = credentialsError != null,
+                    modifier = Modifier.fillMaxWidth().padding(top = 8.dp),
+                )
+                OutlinedTextField(
+                    value = password,
+                    onValueChange = {},
+                    label = { Text("Password") },
+                    singleLine = true,
+                    visualTransformation = PasswordVisualTransformation(),
+                    keyboardOptions = KeyboardOptions(keyboardType = KeyboardType.Password),
+                    isError = credentialsError != null,
+                    modifier = Modifier.fillMaxWidth().padding(top = 8.dp),
+                )
+                if (credentialsError != null) {
+                    Text(
+                        text = credentialsError,
+                        style = MaterialTheme.typography.bodySmall,
+                        color = MaterialTheme.colorScheme.error,
+                        modifier = Modifier.padding(top = 4.dp),
+                    )
+                }
+
+                PrimaryButton(
+                    text = "Sign in",
+                    onClick = {},
+                    modifier = Modifier.padding(top = 24.dp),
+                )
+            }
+        }
+    }
+
+    private fun snapshotBoth(name: String, content: @Composable () -> Unit) {
+        paparazzi.snapshot(name = "$name-light") { BookshelfTheme(darkTheme = false) { content() } }
+        paparazzi.snapshot(name = "$name-dark") { BookshelfTheme(darkTheme = true) { content() } }
+    }
+}
diff --git a/app/app/src/test/snapshots/images/org.modg.bookshelf.ui.screens_DetailScreenPaparazziTest_detailPopulatedLight_detail-populated-dark.png b/app/app/src/test/snapshots/images/org.modg.bookshelf.ui.screens_DetailScreenPaparazziTest_detailPopulatedLight_detail-populated-dark.png
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