feat: add editing and MCP command handling, enhance SSE streaming with usage tracking

- Implemented `Edit` and `McpAdd` commands in the command parser and handler.
- Added a new `stream` module to the runtime for handling streaming events.
- Enhanced `SseParser` to parse usage information from SSE events.
- Introduced `ToolCallAccumulator` for tracking tool calls independently.
- Updated `AppStateRest` to include `app_config` and `MiscState` to track `effort_level` and `selected_index`.
- Modified `LlmClient` to support streaming responses with usage tracking.
- Improved error handling and retry logic in the streaming API calls.
- Added tests for new features and improved markdown rendering in the chat view.

src/app/mode/effort.rs

@@ -2,6 +2,21 @@ use crate::app::state::rest::AppStateRest;
 
 pub const EFFORT_LEVELS: &[&str] = &["low", "medium", "high", "xhigh", "max"];
 
+/// Multiplier applied to the user's configured `max_tokens`, and the temperature to use,
+/// for each entry in `EFFORT_LEVELS` (same index). Higher effort trades a larger token
+/// budget for lower temperature (more deterministic, more room to reason/act).
+const MAX_TOKENS_MULTIPLIER: &[f32] = &[0.5, 1.0, 1.5, 2.0, 3.0];
+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) {
+    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))
+}
+
 pub fn current_effort(state: &AppStateRest) -> usize {
     state.misc.effort_level.min(EFFORT_LEVELS.len() - 1)
 }
@@ -14,5 +29,10 @@ pub fn current_effort_str(state: &AppStateRest) -> &'static str {
 pub fn cycle_effort(state: &mut AppStateRest) {
     let current = current_effort(state);
     state.misc.effort_level = (current + 1) % EFFORT_LEVELS.len();
+    let label = current_effort_str(state);
+    state.push_toast(crate::app::state::types::Toast::new(
+        crate::app::state::types::ToastKind::Info,
+        format!("Effort: {}", label),
+    ));
     state.dirty = true;
 }