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/misc.rs

@@ -19,11 +19,6 @@ impl DirCache {
         let mut w = self.entries.write().await;
         *w = paths;
     }
-
-    pub async fn get(&self) -> Vec<PathBuf> {
-        let r = self.entries.read().await;
-        r.clone()
-    }
 }
 
 #[derive(Debug, Clone)]
@@ -53,10 +48,6 @@ impl ScrollState {
         }
     }
 
-    pub fn scroll_to_bottom(&mut self, total: usize) {
-        self.offset = total.saturating_sub(self.max_visible);
-    }
-
     pub fn set_max_visible(&mut self, max: usize) {
         self.max_visible = max;
     }
@@ -202,26 +193,17 @@ impl InputState {
             None => {}
         }
     }
-
-    pub fn clear(&mut self) {
-        self.buffer.clear();
-        self.cursor = 0;
-        self.history_idx = None;
-    }
 }
 
 #[derive(Debug, Clone)]
 pub struct MiscState {
     pub overlay: Overlay,
     pub toasts: Vec<super::types::Toast>,
-    pub dirty: bool,
     pub yolo_armed: bool,
     pub security_armed: bool,
-    pub security_acknowledged: bool,
     pub esc_press_count: u32,
     pub last_staleness_sweep_ms: i64,
-    pub effort_level: usize,
-    pub editor: Option<crate::app::mode::editor::EditorState>,
+    pub thinking: bool,
 }
 
 impl MiscState {
@@ -229,14 +211,11 @@ impl MiscState {
         MiscState {
             overlay: Overlay::None,
             toasts: Vec::new(),
-            dirty: true,
             yolo_armed: false,
             security_armed: false,
-            security_acknowledged: false,
             esc_press_count: 0,
             last_staleness_sweep_ms: 0,
-            effort_level: 1,
-            editor: None,
+            thinking: false,
         }
     }