feat: Display default model in dropdowns and consolidate Git settings menu (#135)

* types: add commitMessageModel to DesktopSettings

* store: add commitMessageModel state and fetch logic

* lib: implement persistence for commitMessageModel setting

* ui: create GitSettings component for model selection

* ui: add Git section to OpenChamber settings sidebar

* ui: register GitSectionContent in OpenChamberPage

* server: use commitMessageModel setting for AI generation

* tauri: sanitize commitMessageModel in settings commands

* tauri: use commitMessageModel for desktop message generation

* build: update lockfile and package configuration

* refactor(openchamber): improve default model parsing with fallback logic

* feat(openchamber): improve model selection fallback logic

* refactor: move worktree settings into git section

* refactor(openchamber): merge worktree into git section

* refactor[worktree]: simplify empty state layout

* revert: rollback bun.lock and package.json to main

* feat(git): restrict model selection to OpenCode provider

packages/desktop/src-tauri/src/commands/git.rs

@@ -2089,13 +2089,30 @@ Diff summary:
 {}"#,
         diff_summaries
     );
+ 
+    let settings = state.settings().load().await.unwrap_or(serde_json::Value::Null);
+    let raw_model = settings.get("commitMessageModel")
+        .and_then(|v| v.as_str())
+        .unwrap_or("");
+
+    let model_candidate = raw_model
+        .split('/')
+        .last()
+        .unwrap_or(raw_model)
+        .trim();
+
+    let model = if model_candidate.is_empty() {
+        "big-pickle"
+    } else {
+        model_candidate
+    };
 
     // 3. Call API
     let client = Client::new();
     let res = client
         .post("https://opencode.ai/zen/v1/chat/completions")
         .json(&serde_json::json!({
-            "model": "big-pickle",
+            "model": model,
             "messages": [{ "role": "user", "content": prompt }],
             "max_tokens": 3000,
             "stream": false,

packages/desktop/src-tauri/src/commands/settings.rs

@@ -257,6 +257,14 @@ fn sanitize_settings_update(payload: &Value) -> Value {
                 result_obj.insert("defaultAgent".to_string(), json!(trimmed));
             }
         }
+        if let Some(Value::String(s)) = obj.get("commitMessageModel") {
+            let trimmed = s.trim();
+            if trimmed.is_empty() {
+                result_obj.insert("commitMessageModel".to_string(), Value::Null);
+            } else {
+                result_obj.insert("commitMessageModel".to_string(), json!(trimmed));
+            }
+        }
 
         // Boolean fields
         if let Some(Value::Bool(b)) = obj.get("useSystemTheme") {