ADD - separate Home and Lock wallpapers

Store independent Home Screen and Lock Screen wallpaper selections, preserve legacy preferences, and route gallery or camera picks to the selected destination. Add the Settings segmented selector and contract coverage.

frontend/src/utils/preferences.test.ts

@@ -196,6 +196,10 @@ describe('preferences', () => {
     expect(value.settings.wallpaperImageUrl).toBe(
       'https://media.example/current.jpg',
     )
+    expect(value.settings.lockWallpaper).toBe('custom')
+    expect(value.settings.lockWallpaperImageUrl).toBe(
+      'https://media.example/current.jpg',
+    )
     expect(value.settings.wallpaperHistory).toHaveLength(4)
     expect(
       value.settings.wallpaperHistory.map((entry) => entry.wallpaper),
@@ -213,4 +217,24 @@ describe('preferences', () => {
     expect(value.settings.wallpaper).toBe('midnight')
     expect(value.settings.wallpaperImageUrl).toBeNull()
   })
+
+  it('restores independent Home Screen and Lock Screen wallpapers', () => {
+    const value = parsePhonePreferences(
+      JSON.stringify({
+        version: 1,
+        settings: {
+          wallpaper: 'ocean',
+          lockWallpaper: 'custom',
+          lockWallpaperImageUrl: 'https://media.example/lock.jpg',
+        },
+      }),
+    )
+
+    expect(value.settings.wallpaper).toBe('ocean')
+    expect(value.settings.wallpaperImageUrl).toBeNull()
+    expect(value.settings.lockWallpaper).toBe('custom')
+    expect(value.settings.lockWallpaperImageUrl).toBe(
+      'https://media.example/lock.jpg',
+    )
+  })
 })

frontend/src/utils/preferences.ts

@@ -48,6 +48,7 @@ export type RingtoneId = (typeof RINGTONE_IDS)[number]
 export type NotificationSoundId = (typeof NOTIFICATION_SOUND_IDS)[number]
 export type BuiltInWallpaperId = (typeof WALLPAPER_IDS)[number]
 export type WallpaperId = BuiltInWallpaperId | 'custom'
+export type WallpaperTarget = 'home' | 'lock'
 export type WallpaperHistoryEntry = {
   imageUrl: string | null
   wallpaper: WallpaperId
@@ -72,6 +73,8 @@ export type PhonePreferencesV1 = {
     focusMode: boolean
     frame: PhoneFrameId
     graphicsMode: GraphicsMode
+    lockWallpaper: WallpaperId
+    lockWallpaperImageUrl: string | null
     notificationSound: NotificationSoundId
     notificationDurationSeconds: number
     notificationVolume: number
@@ -145,6 +148,8 @@ export const DEFAULT_PHONE_PREFERENCES: PhonePreferencesV1 = {
     focusMode: false,
     frame: 'black',
     graphicsMode: 'ultimate',
+    lockWallpaper: 'midnight',
+    lockWallpaperImageUrl: null,
     notificationSound: 'chime',
     notificationDurationSeconds: 10,
     notificationVolume: 70,
@@ -280,6 +285,20 @@ export function parsePhonePreferences(raw: string | null): PhonePreferencesV1 {
       settings.wallpaper === 'custom' && wallpaperImageUrl
         ? 'custom'
         : readChoice(settings.wallpaper, WALLPAPER_IDS, defaults.wallpaper)
+    const requestedLockWallpaperImageUrl = readWallpaperImageUrl(
+      settings.lockWallpaperImageUrl,
+    )
+    const lockWallpaper =
+      settings.lockWallpaper === 'custom' && requestedLockWallpaperImageUrl
+        ? 'custom'
+        : typeof settings.lockWallpaper === 'string' &&
+            WALLPAPER_IDS.includes(settings.lockWallpaper as BuiltInWallpaperId)
+          ? (settings.lockWallpaper as BuiltInWallpaperId)
+          : wallpaper
+    const lockWallpaperImageUrl =
+      lockWallpaper === 'custom'
+        ? (requestedLockWallpaperImageUrl ?? wallpaperImageUrl)
+        : null
     const wallpaperHistory = readWallpaperHistory(settings.wallpaperHistory)
 
     return {
@@ -305,6 +324,8 @@ export function parsePhonePreferences(raw: string | null): PhonePreferencesV1 {
           GRAPHICS_MODE_IDS,
           defaults.graphicsMode,
         ),
+        lockWallpaper,
+        lockWallpaperImageUrl,
         notificationSound: readChoice(
           settings.notificationSound,
           NOTIFICATION_SOUND_IDS,