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/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,
 }