feat(chat): message persistence + background notifications (#2)

* feat(chat): message persistence + background notifications

Two critical gaps for daily-driver use:

1. Message persistence (Room database):
   - New ChatMessageEntity / ChatMessageDao / HermesDatabase layer
   - Every user message, streaming token, tool result, and assistant
     reply is written to a local Room DB as it arrives
   - switchSession loads cached messages instantly from Room before
     the REST call returns — no more blank screen while loading
   - Session resume also loads from cache first
   - Messages survive app kills, process death, and configuration
     changes
   - ChatViewModel changed from ViewModel() to AndroidViewModel(app)
     to access the database context

2. Background notifications (foreground service):
   - ChatNotificationService keeps the WebSocket alive while the app
     is backgrounded and posts a high-priority notification when a
     MessageComplete or ClarifyRequest event arrives while the app
     is not in the foreground
   - Lifecycle wired via LifecycleEventObserver in ChatScreen:
     ON_STOP starts the service, ON_START stops it
   - Tapping the notification returns to the chat
   - New permissions: POST_NOTIFICATIONS, FOREGROUND_SERVICE,
     FOREGROUND_SERVICE_DATA_SYNC

Build changes:
   - Added Room 2.7.1 + KSP to version catalog
   - Added WorkManager 2.10.0 (reserved for future polling fallback)
   - Updated ChatViewModelTest to mock HermesDatabase + use
     AndroidViewModel constructor

* fix(build): use KSP 2.3.9 (new versioning scheme for Kotlin 2.3.x)

* fix(build): add Room schemaDirectory (required by Room Gradle plugin)

* fix(compile): add else branch to WsEvent when expression (exhaustiveness)

* ci(release): add release workflow + R8 minification + proguard rules

New .github/workflows/release.yml:
- Triggers on tag pushes (v*) and manual workflow_dispatch
- Runs full CI (ktlint + lint + test) before building
- Builds assembleRelease with version injection from tag
- Creates a GitHub Release with auto-generated changelog
- Attaches the release APK to the release

Build changes:
- Release builds now use R8 minification (isMinifyEnabled=true)
  and resource shrinking (isShrinkResources=true) for smaller APKs
- versionCode/versionName injectable via -PversionCode / -PversionName
  Gradle properties (passed by CI from the git tag)
- Local dev builds default to versionCode=1, versionName=1.0-dev

ProGuard rules:
- Keep all data model classes (Gson reflection)
- Keep Room entities and RoomDatabase subclasses
- Keep OkHttp/Retrofit interface methods
- Suppress warnings for Compose, Security Crypto, Coroutines

* feat(ci): release workflow + proguard rules + test fix

Release workflow (.github/workflows/release.yml):
  - Triggers on tag push (v*) or manual workflow_dispatch
  - Two jobs: ci (ktlint+lint+test) → build-release
  - Builds a minified, shrunk release APK with version from tag
  - Creates a GitHub Release with auto-generated release notes
  - Attaches the APK as a release asset

Build config:
  - versionCode/versionName now injected from CI via -P flags
  - Release build enables isMinifyEnabled + isShrinkResources
  - proguard-rules.pro: keep rules for Gson models, Room entities,
    OkHttp/Retrofit interfaces, Coroutines, Compose, BuildConfig

Test fix:
  - ChatViewModelTest: use coEvery for suspend DAO methods instead
    of every (compile error — suspend functions need coEvery)
  - Added stubs for all suspend DAO methods used by the ViewModel

---------

Co-authored-by: M57 <hy4ri@users.noreply.github.com>

app/src/test/java/com/m57/hermescontrol/ui/chat/ChatViewModelTest.kt

@@ -1,11 +1,16 @@
 package com.m57.hermescontrol.ui.chat
 
+import android.app.Application
 import com.m57.hermescontrol.data.local.AuthManager
+import com.m57.hermescontrol.data.local.ChatMessageDao
+import com.m57.hermescontrol.data.local.HermesDatabase
 import com.m57.hermescontrol.data.ws.HermesWsClient
 import com.m57.hermescontrol.data.ws.JsonRpcError
 import com.m57.hermescontrol.data.ws.WsEvent
 import com.m57.hermescontrol.data.ws.WsMethods
+import io.mockk.coEvery
 import io.mockk.every
+import io.mockk.mockk
 import io.mockk.mockkObject
 import io.mockk.mockkStatic
 import io.mockk.unmockkAll
@@ -13,6 +18,7 @@ import io.mockk.verify
 import kotlinx.coroutines.Dispatchers
 import kotlinx.coroutines.ExperimentalCoroutinesApi
 import kotlinx.coroutines.flow.MutableSharedFlow
+import kotlinx.coroutines.flow.flowOf
 import kotlinx.coroutines.test.StandardTestDispatcher
 import kotlinx.coroutines.test.advanceUntilIdle
 import kotlinx.coroutines.test.resetMain
@@ -31,6 +37,9 @@ import org.junit.Test
 class ChatViewModelTest {
     private val testDispatcher = StandardTestDispatcher()
     private val mockEventsFlow = MutableSharedFlow<WsEvent>(extraBufferCapacity = 64)
+    private lateinit var app: Application
+    private val mockDao: ChatMessageDao = mockk(relaxed = true)
+    private val mockDb: HermesDatabase = mockk(relaxed = true)
 
     @Before
     fun setUp() {
@@ -43,11 +52,23 @@ class ChatViewModelTest {
 
         mockkObject(AuthManager)
         mockkObject(HermesWsClient)
+        mockkObject(HermesDatabase)
+
+        app = mockk(relaxed = true)
 
         every { AuthManager.getToken() } returns "test-token"
         every { HermesWsClient.events } returns mockEventsFlow
         every { HermesWsClient.connect() } returns Unit
         every { HermesWsClient.disconnect() } returns Unit
+        every { mockDb.chatMessageDao() } returns mockDao
+        every { HermesDatabase.get(any()) } returns mockDb
+        every { mockDao.observeMessagesForSession(any()) } returns flowOf(emptyList())
+        coEvery { mockDao.getMessagesForSession(any()) } returns emptyList()
+        coEvery { mockDao.upsert(any()) } returns Unit
+        coEvery { mockDao.upsertAll(any()) } returns Unit
+        coEvery { mockDao.finalizeMessage(any(), any()) } returns Unit
+        coEvery { mockDao.deleteMessagesForSession(any()) } returns Unit
+        coEvery { mockDao.count() } returns 0
 
         // Default mock stubs for requests returning unique IDs
         var reqCount = 0
@@ -70,7 +91,7 @@ class ChatViewModelTest {
     @Test
     fun testInitialStateAndConnection() =
         runTest {
-            val viewModel = ChatViewModel()
+            val viewModel = ChatViewModel(app)
             advanceUntilIdle()
 
             verify { HermesWsClient.connect() }
@@ -81,7 +102,7 @@ class ChatViewModelTest {
     @Test
     fun testGatewayReady_createsSessionIfNoneExists() =
         runTest {
-            val viewModel = ChatViewModel()
+            val viewModel = ChatViewModel(app)
             advanceUntilIdle()
 
             mockEventsFlow.emit(WsEvent.GatewayReady(null))
@@ -107,7 +128,7 @@ class ChatViewModelTest {
                 createReqId
             }
 
-            val viewModel = ChatViewModel()
+            val viewModel = ChatViewModel(app)
             advanceUntilIdle()
 
             // Trigger GatewayReady -> triggers createNewSession
@@ -135,7 +156,7 @@ class ChatViewModelTest {
                 listReqId
             }
 
-            val viewModel = ChatViewModel()
+            val viewModel = ChatViewModel(app)
             advanceUntilIdle()
 
             mockEventsFlow.emit(WsEvent.GatewayReady(null))
@@ -169,7 +190,7 @@ class ChatViewModelTest {
     @Test
     fun testMessageStreamingFlow() =
         runTest {
-            val viewModel = ChatViewModel()
+            val viewModel = ChatViewModel(app)
             advanceUntilIdle()
 
             // Set active session ID first
@@ -242,7 +263,7 @@ class ChatViewModelTest {
                 createReqId
             }
 
-            val viewModel = ChatViewModel()
+            val viewModel = ChatViewModel(app)
             advanceUntilIdle()
 
             // Set session ID
@@ -276,7 +297,7 @@ class ChatViewModelTest {
     @Test
     fun testSendMessage() =
         runTest {
-            val viewModel = ChatViewModel()
+            val viewModel = ChatViewModel(app)
             advanceUntilIdle()
 
             // Trigger GatewayReady -> triggers createSession -> feed result to set active session
@@ -309,7 +330,7 @@ class ChatViewModelTest {
     @Test
     fun testSwitchSession() =
         runTest {
-            val viewModel = ChatViewModel()
+            val viewModel = ChatViewModel(app)
             advanceUntilIdle()
 
             viewModel.switchSession("session-456")
@@ -339,7 +360,7 @@ class ChatViewModelTest {
                 createReqId
             }
 
-            val viewModel = ChatViewModel()
+            val viewModel = ChatViewModel(app)
             advanceUntilIdle()
 
             mockEventsFlow.emit(WsEvent.GatewayReady(null))