Add dependency wiring, token storage, and app entry points

- AppDependencies: manual DI container with lazy singletons
- TokenStore: DataStore-backed persistence for server URL, access token,
  theme preference, and accent color selection
- DataStoreFactory: multiplatform DataStore creation
- LocalAppDependencies: CompositionLocal for DI access in composables
- App.kt: root composable with theme + Coil ImageLoader (Ktor engine)
- MainActivity: creates AppDependencies, provides via CompositionLocal
- Coil configured with authenticated Ktor HttpClient for private images

Co-Authored-By: Claude Opus 4.6 (1M context)

Signed-off-by: Avinal Kumar <avinal.xlvii@gmail.com>

composeApp/src/commonMain/kotlin/com/avinal/memos/App.kt

@@ -0,0 +1,27 @@
+package com.avinal.memos
+
+import androidx.compose.runtime.Composable
+import coil3.ImageLoader
+import coil3.compose.setSingletonImageLoaderFactory
+import coil3.compose.LocalPlatformContext
+import coil3.network.ktor3.KtorNetworkFetcherFactory
+import com.avinal.memos.ui.navigation.AppNavHost
+import com.avinal.memos.ui.theme.MemosAppTheme
+import com.avinal.memos.util.LocalAppDependencies
+
+@Composable
+fun App() {
+    val deps = LocalAppDependencies.current
+
+    setSingletonImageLoaderFactory { context ->
+        ImageLoader.Builder(context)
+            .components {
+                add(KtorNetworkFetcherFactory(httpClient = deps.httpClient))
+            }
+            .build()
+    }
+
+    MemosAppTheme {
+        AppNavHost(deps)
+    }
+}

composeApp/src/commonMain/kotlin/com/avinal/memos/AppDependencies.kt

@@ -0,0 +1,48 @@
+package com.avinal.memos
+
+import com.avinal.memos.api.HttpClientFactory
+import com.avinal.memos.api.MemosApiClient
+import com.avinal.memos.db.MemosDatabase
+import com.avinal.memos.db.createPlatformDatabase
+import com.avinal.memos.domain.AuthRepository
+import com.avinal.memos.domain.MemoRepository
+import com.avinal.memos.util.TokenStore
+import com.avinal.memos.util.createDataStore
+import kotlinx.coroutines.CoroutineScope
+import kotlinx.coroutines.Dispatchers
+import kotlinx.coroutines.IO
+import kotlinx.coroutines.launch
+
+class AppDependencies(
+    dataStorePath: String,
+    platformContext: Any,
+) {
+    @Volatile private var cachedToken: String? = null
+    @Volatile private var cachedServerUrl: String? = null
+
+    private val dataStore = createDataStore(dataStorePath)
+    val tokenStore = TokenStore(dataStore)
+
+    val database: MemosDatabase by lazy { createPlatformDatabase(platformContext) }
+
+    val httpClient by lazy {
+        HttpClientFactory.create { cachedToken }
+    }
+
+    val apiClient: MemosApiClient by lazy {
+        MemosApiClient(
+            httpClient = httpClient,
+            baseUrlProvider = { cachedServerUrl ?: "" },
+        )
+    }
+
+    val authRepository: AuthRepository by lazy { AuthRepository(apiClient, tokenStore) }
+    val memoRepository: MemoRepository by lazy { MemoRepository(apiClient, database.memoDao()) }
+
+    fun initialize() {
+        CoroutineScope(Dispatchers.IO).launch {
+            launch { tokenStore.accessToken.collect { cachedToken = it } }
+            launch { tokenStore.serverUrl.collect { cachedServerUrl = it } }
+        }
+    }
+}

composeApp/src/commonMain/kotlin/com/avinal/memos/util/DataStoreFactory.kt

@@ -0,0 +1,9 @@
+package com.avinal.memos.util
+
+import androidx.datastore.core.DataStore
+import androidx.datastore.preferences.core.PreferenceDataStoreFactory
+import androidx.datastore.preferences.core.Preferences
+import okio.Path.Companion.toPath
+
+fun createDataStore(path: String): DataStore<Preferences> =
+    PreferenceDataStoreFactory.createWithPath(produceFile = { path.toPath() })

composeApp/src/commonMain/kotlin/com/avinal/memos/util/LocalDependencies.kt

@@ -0,0 +1,8 @@
+package com.avinal.memos.util
+
+import androidx.compose.runtime.staticCompositionLocalOf
+import com.avinal.memos.AppDependencies
+
+val LocalAppDependencies = staticCompositionLocalOf<AppDependencies> {
+    error("AppDependencies not provided")
+}

composeApp/src/commonMain/kotlin/com/avinal/memos/util/TokenStore.kt

@@ -0,0 +1,48 @@
+package com.avinal.memos.util
+
+import androidx.datastore.core.DataStore
+import androidx.datastore.preferences.core.Preferences
+import androidx.datastore.preferences.core.edit
+import androidx.datastore.preferences.core.stringPreferencesKey
+import kotlinx.coroutines.flow.Flow
+import kotlinx.coroutines.flow.map
+
+class TokenStore(private val dataStore: DataStore<Preferences>) {
+
+    val serverUrl: Flow<String?> = dataStore.data.map { it[KEY_SERVER_URL] }
+    val accessToken: Flow<String?> = dataStore.data.map { it[KEY_ACCESS_TOKEN] }
+    val theme: Flow<String> = dataStore.data.map { it[KEY_THEME] ?: "DARK" }
+    val accentColor: Flow<String> = dataStore.data.map { it[KEY_ACCENT] ?: "Cobalt" }
+
+    suspend fun saveCredentials(serverUrl: String, token: String) {
+        dataStore.edit { prefs ->
+            prefs[KEY_SERVER_URL] = serverUrl
+            prefs[KEY_ACCESS_TOKEN] = token
+        }
+    }
+
+    suspend fun saveTheme(theme: String) {
+        dataStore.edit { it[KEY_THEME] = theme }
+    }
+
+    suspend fun saveAccentColor(name: String) {
+        dataStore.edit { it[KEY_ACCENT] = name }
+    }
+
+    suspend fun clear() {
+        dataStore.edit {
+            val theme = it[KEY_THEME]
+            val accent = it[KEY_ACCENT]
+            it.clear()
+            if (theme != null) it[KEY_THEME] = theme
+            if (accent != null) it[KEY_ACCENT] = accent
+        }
+    }
+
+    companion object {
+        private val KEY_SERVER_URL = stringPreferencesKey("server_url")
+        private val KEY_ACCESS_TOKEN = stringPreferencesKey("access_token")
+        private val KEY_THEME = stringPreferencesKey("app_theme")
+        private val KEY_ACCENT = stringPreferencesKey("accent_color")
+    }
+}