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/runtime/commands.rs

@@ -78,6 +78,9 @@ pub fn apply_command(command: Command) -> Vec<Action> {
         Command::ModelList => {
             vec![Action::ModelList]
         }
+        Command::Compact => {
+            vec![Action::Compact]
+        }
         Command::Unknown(cmd) => {
             vec![Action::SystemNote {
                 kind: "error".to_string(),