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/mode/effort.rs

@@ -13,11 +13,11 @@ const TEMPERATURE_OVERRIDE: &[f32] = &[0.9, 0.7, 0.5, 0.3, 0.1];
 
 /// Maps an effort level index to the `(temperature, max_tokens)` pair that should be sent
 /// to the LLM, scaling the user's configured `max_tokens` by the level's multiplier.
-pub fn generation_params(level: usize, base_max_tokens: u32) -> (f32, u32) {
+pub fn generation_params(level: usize, base_max_tokens: Option<u32>) -> (f32, Option<u32>) {
     let idx = level.min(EFFORT_LEVELS.len() - 1);
     let temperature = TEMPERATURE_OVERRIDE[idx];
-    let max_tokens = ((base_max_tokens as f32) * MAX_TOKENS_MULTIPLIER[idx]) as u32;
-    (temperature, max_tokens.max(256))
+    let max_tokens = base_max_tokens.map(|t| ((t as f32) * MAX_TOKENS_MULTIPLIER[idx]) as u32);
+    (temperature, max_tokens.map(|t| t.max(256)))
 }
 
 /// Return the current effort level index, clamped to a valid `EFFORT_LEVELS` slot.