Refactor IPC and DTO structures; remove unused code and streamline message handling

- Removed unused structs and methods from `response.rs`, `usage.rs`, and `client.rs`.
- Simplified `Connection` handling in `conn.rs` to only support Unix sockets.
- Updated `IpcServer` to exclusively use Unix sockets and removed TCP handling.
- Cleaned up `editlog.rs` by removing loading and recent entry methods.
- Refactored `memory.rs` to eliminate unused functions related to lesson promotion and retrospective creation.
- Enhanced `search.rs` to support multiple search providers and improved error handling.
- Updated chat view logic to simplify message display and improve user experience.
- Removed deprecated modules and constants from various files to streamline the codebase.

src/app/state/rest.rs

@@ -28,14 +28,6 @@ impl ChatMessageDisplay {
     }
 }
 
-#[derive(Clone)]
-pub struct CronJob {
-    pub id: String,
-    pub description: String,
-    pub cron_expr: String,
-    pub active: bool,
-}
-
 #[derive(Clone)]
 pub struct AppStateRest {
     pub mode: AgentMode,
@@ -46,12 +38,10 @@ pub struct AppStateRest {
     pub memory_dir: PathBuf,
     pub download_dir: PathBuf,
     pub worktrees_dir: PathBuf,
-    pub current_dir: PathBuf,
     pub dir_cache: Arc<RwLock<DirCache>>,
     pub edit_log: EditLog,
     pub session_runtime: Option<SessionRuntime>,
     pub sessions: Vec<crate::model::session::Session>,
-    pub crons: Vec<CronJob>,
     pub transcript_cache: TranscriptCache,
     pub scroll: ScrollState,
     pub input: InputState,
@@ -83,7 +73,6 @@ impl AppStateRest {
             memory_dir,
             download_dir,
             worktrees_dir,
-            current_dir: std::env::current_dir().unwrap_or_default(),
             turn_events: Arc::new(Mutex::new(VecDeque::new())),
             turn_in_flight: Arc::new(Mutex::new(false)),
             dir_cache: Arc::new(RwLock::new(dir_cache)),
@@ -92,7 +81,6 @@ impl AppStateRest {
             workflow_engine: WorkflowEngine::new(),
             mcp_manager: McpManager::new(),
             sessions: Vec::new(),
-            crons: Vec::new(),
             transcript_cache: TranscriptCache::new(200),
             scroll: ScrollState::new(),
             input: InputState::new(),
@@ -102,10 +90,6 @@ impl AppStateRest {
         }
     }
 
-    pub fn mode(&self) -> AgentMode {
-        self.mode
-    }
-
     pub fn turn_in_flight(&self) -> bool {
         self.turn_in_flight.lock().map(|g| *g).unwrap_or(false)
     }
@@ -147,7 +131,7 @@ impl AppStateRest {
             workspaces: self.workspace_roots.clone(),
             session_dir: self.session_dir.clone(),
             memory_dir: self.memory_dir.clone(),
-            download_dir: self.download_dir.clone(),
+            _download_dir: self.download_dir.clone(),
             worktrees_dir: self.worktrees_dir.clone(),
             dir_cache: self.dir_cache.clone(),
             internet_mode: self.settings.internet_mode.clone(),