feat(lsp): implement LSP client and server management

- Added LspClient for handling communication with LSP servers, including methods for initialization, notifications, and requests.
- Introduced LspManager to manage multiple LSP server connections, allowing for connection, disconnection, and retrieval of server capabilities.
- Created tools for connecting to LSP servers, retrieving diagnostics, hover information, code completion, definitions, and references.
- Enhanced UI rendering to display token usage and settings in the overlay.
- Updated status bar to show current token usage and selected provider/model.

src/app/state/misc.rs

@@ -277,6 +277,8 @@ pub struct MiscState {
     pub selected_index: usize,
     pub editor: Option<super::super::mode::editor::EditorState>,
     pub api_connected: bool,
+    #[allow(dead_code)]
+    pub api_context_length: Option<u32>,
     pub tick_count: u64,
     pub todo_content: String,
 }
@@ -294,6 +296,7 @@ impl MiscState {
             selected_index: 0,
             editor: None,
             api_connected: false,
+            api_context_length: None,
             tick_count: 0,
             todo_content: String::new(),
         }

src/app/state/rest.rs

@@ -12,6 +12,7 @@ use tokio::sync::RwLock;
 use super::misc::{DirCache, InputState, MiscState, ScrollState};
 use super::runtime::{SessionRuntime, TurnEvent};
 use super::types::{Origin, Toast, TranscriptCache};
+use crate::app::lsp::LspManager;
 use crate::app::mcp::manager::McpManager;
 use crate::app::workflow::engine::WorkflowEngine;
 use crate::model::app_config::AppConfig;
@@ -66,6 +67,7 @@ pub struct AppStateRest {
     pub abort_flag: Arc<std::sync::atomic::AtomicBool>,
     pub workflow_engine: WorkflowEngine,
     pub mcp_manager: McpManager,
+    pub lsp_manager: Arc<Mutex<LspManager>>,
     pub dirty: bool,
     pub quit: bool,
 }
@@ -117,6 +119,7 @@ impl AppStateRest {
             session_runtime: Some(SessionRuntime::new(session_dir.clone())),
             workflow_engine: WorkflowEngine::new(),
             mcp_manager: McpManager::new(),
+            lsp_manager: Arc::new(Mutex::new(LspManager::new())),
             sessions: Vec::new(),
             transcript_cache: TranscriptCache::new(200),
             scroll: ScrollState::new(),
@@ -196,6 +199,7 @@ impl AppStateRest {
             dir_cache: self.dir_cache.clone(),
             origin,
             graduated_checks: Vec::new(),
+            lsp_manager: self.lsp_manager.clone(),
         }
     }
 }

src/app/state/runtime.rs

@@ -10,6 +10,10 @@ use serde::{Deserialize, Serialize};
 pub struct UsageStats {
     pub tokens_in: u64,
     pub tokens_out: u64,
+    #[serde(default)]
+    pub last_tokens_in: u64,
+    #[serde(default)]
+    pub last_tokens_out: u64,
     pub api_calls: u64,
     pub review_tokens: u64,
     pub total_ms: u64,
@@ -96,6 +100,7 @@ pub enum TurnEvent {
         tokens_in: u64,
         tokens_out: u64,
     },
+    Compacted(Vec<crate::dto::chat::message::ChatMessage>),
     Error(String),
     Done,
 }