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/controller/command.rs

@@ -24,6 +24,7 @@ pub enum Command {
         command: String,
     },
     ModelList,
+    Compact,
     Unknown(String),
 }
 
@@ -86,6 +87,7 @@ pub fn parse_command(text: &str) -> Command {
             }
         }
         "/model" => Command::ModelList,
+        "/compact" => Command::Compact,
         _ => Command::Unknown(cmd.to_string()),
     }
 }