feat(quick-pane): add follow-up chat renewal

ui/src-tauri/src/ui_state.rs

@@ -46,7 +46,6 @@ pub struct QuickPaneSettings {
     pub follow_up_provider: String,
     pub follow_up_model: String,
     pub instructions: String,
-    pub maximum_seconds: u32,
     pub maximum_tool_calls: u32,
 }
 
@@ -58,8 +57,7 @@ impl Default for QuickPaneSettings {
             model: String::new(),
             follow_up_provider: String::new(),
             follow_up_model: String::new(),
-            instructions: "Answer quickly. Do not use subagents. Prefer read-only inspection. Escalate mutations, multi-step work, or work likely to exceed budget.".to_owned(),
-            maximum_seconds: 60,
+            instructions: "Answer quickly. Do not use subagents. Prefer read-only inspection. Escalate mutations, multi-step work, or complex work.".to_owned(),
             maximum_tool_calls: 6,
         }
     }
@@ -232,9 +230,8 @@ pub fn validate(state: &UiStateV1) -> Result<(), String> {
     if quick.instructions.is_empty() || quick.instructions.len() > 4096 {
         return Err("Quick-pane instructions must contain 1 to 4096 bytes".to_owned());
     }
-    if !(1..=600).contains(&quick.maximum_seconds) || !(1..=64).contains(&quick.maximum_tool_calls)
-    {
-        return Err("Quick-pane limits are outside the supported range".to_owned());
+    if !(1..=64).contains(&quick.maximum_tool_calls) {
+        return Err("Quick-pane tool-call limit is outside the supported range".to_owned());
     }
     total_string_bytes = total_string_bytes
         .saturating_add(quick.workspace.len())
@@ -281,7 +278,16 @@ pub fn load_from(app_data_dir: &Path) -> Result<UiStateV1, String> {
     if content.len() > MAX_FILE_BYTES {
         return Err("UI state file exceeds the size limit".to_owned());
     }
-    let state: UiStateV1 = serde_json::from_slice(&content)
+    let mut value: serde_json::Value = serde_json::from_slice(&content)
+        .map_err(|error| format!("UI state is corrupt or unsupported: {error}"))?;
+    // Read legacy persisted cap once, but never retain or serialize it again.
+    if let Some(quick_pane) = value
+        .get_mut("quickPane")
+        .and_then(serde_json::Value::as_object_mut)
+    {
+        quick_pane.remove("maximumSeconds");
+    }
+    let state: UiStateV1 = serde_json::from_value(value)
         .map_err(|error| format!("UI state is corrupt or unsupported: {error}"))?;
     validate(&state)?;
     Ok(state)
@@ -443,11 +449,27 @@ mod tests {
         state.quick_pane.follow_up_provider = "provider".into();
         state.quick_pane.follow_up_model = "follow-up-model".into();
         assert!(validate(&state).is_ok());
-        state.quick_pane.maximum_seconds = 0;
+        state.quick_pane.maximum_tool_calls = 0;
         assert!(validate(&state).is_err());
         fs::remove_dir_all(root).unwrap();
     }
 
+    #[test]
+    fn legacy_maximum_seconds_loads_but_is_not_serialized() {
+        let root = temp_dir("quick-pane-legacy-seconds");
+        fs::create_dir_all(&root).unwrap();
+        let path = state_path(&root);
+        fs::write(
+            &path,
+            r#"{"version":1,"quickPane":{"workspace":"","provider":"","model":"","followUpProvider":"","followUpModel":"","instructions":"valid","maximumSeconds":60,"maximumToolCalls":6}}"#,
+        )
+        .unwrap();
+        let state = load_from(&root).unwrap();
+        save_to(&root, &state).unwrap();
+        assert!(!fs::read_to_string(&path).unwrap().contains("maximumSeconds"));
+        fs::remove_dir_all(root).unwrap();
+    }
+
     #[test]
     fn second_save_replaces_valid_state_without_leaving_temporary_files() {
         let root = temp_dir("replace");