這次主要建立 NoteEditViewModel，用來處理新增筆記和載入現有筆記

AI 寫扣經過

1. 建立 AllNotesScreen

   @Composable
   fun AllNotesScreen(
       modifier: Modifier = Modifier,
       uiState: NoteListUiState,
       onNavigateBack: () -> Unit,
       onNoteClick: (Long) -> Unit
   ) {
       AllNotesScreenContent(
           modifier = modifier,
           notes = uiState.notes, // We show all notes, not filtered ones
           onNavigateBack = onNavigateBack,
           onNoteClick = onNoteClick
       )
   }
   
   @OptIn(ExperimentalMaterial3Api::class)
   @Composable
   private fun AllNotesScreenContent(
       modifier: Modifier = Modifier,
       notes: List<com.example.androidtemplate.domain.model.Note>,
       onNavigateBack: () -> Unit,
       onNoteClick: (Long) -> Unit
   ) {
       Scaffold(
           modifier = modifier.fillMaxSize(),
           topBar = {
               TopAppBar(
                   title = { Text("全部筆記") },
                   navigationIcon = {
                       IconButton(onClick = onNavigateBack) {
                           Icon(
                               imageVector = Icons.Default.ArrowBack,
                               contentDescription = "返回"
                           )
                       }
                   }
               )
           }
       ) { innerPadding ->
           SearchResultList(
               notes = notes,
               onNoteClick = onNoteClick,
               modifier = Modifier.padding(innerPadding)
           )
       }
   }
   

2. 建立 NoteEditViewModel

   class NoteEditViewModel @Inject constructor(
       private val noteUseCases: NoteUseCases,
       savedStateHandle: SavedStateHandle
   ) : ViewModel() {
   
       private val _uiState = MutableStateFlow(NoteEditUiState())
       val uiState = _uiState.asStateFlow()
   
       private val noteId: Long = savedStateHandle.get<String>("id")?.toLongOrNull() ?: 0L
   
       init {
           if (noteId != 0L) {
               loadNote()
           } else {
               _uiState.value = NoteEditUiState(
                   note = createNewNote(),
                   isLoading = false
               )
           }
       }
   
       private fun loadNote() {
           viewModelScope.launch {
               val note = noteUseCases.getNoteById(noteId) // Need to add this use case
               _uiState.value = NoteEditUiState(note = note, isLoading = false)
           }
       }
   
       fun saveNote(title: String, content: String) {
           viewModelScope.launch {
               val noteToSave = _uiState.value.note?.copy(
                   title = title,
                   content = content
               ) ?: createNewNote().copy(
                   title = title,
                   content = content
               )
               noteUseCases.saveNote(noteToSave)
               _uiState.value = _uiState.value.copy(isNoteSaved = true)
           }
       }
   
       private fun createNewNote(): Note {
           return Note(
               id = 0L,
               title = "",
               content = "",
               categoryId = 0L, // Default or "Uncategorized"
               tags = emptyList(),
               createdAt = System.currentTimeMillis(),
               updatedAt = System.currentTimeMillis()
           )
       }
   }
   

3. 更新 NavRoute

   sealed interface NavRoute {
   
       /**
        * 首頁路由
        */
       @Serializable
       data object Home : NavRoute
   
       @Serializable
       data object AllNotes : NavRoute
   
       @Serializable
       data object AllNotes : NavRoute
   
       /**
        * 筆記編輯/新增路由
        *
        * @param noteId 筆記 ID (0L for new note)
        */
       @Serializable
       data class NoteEdit(val noteId: String) : NavRoute
   
       /**
        * 設定頁面路由
        */
       @Serializable
       data object Settings : NavRoute
   }