feat(rpc): add validated desktop Pi RPC command palette

ui/src-tauri/src/ui_state.rs

@@ -58,6 +58,8 @@ pub struct UiStateV1 {
     #[serde(default, skip_serializing_if = "Option::is_none")]
     pub interface_scale: Option<f64>,
     #[serde(default, skip_serializing_if = "Option::is_none")]
+    pub default_new_session_worktree: Option<String>,
+    #[serde(default, skip_serializing_if = "Option::is_none")]
     pub dismissed_collision_warning: Option<bool>,
 }
 
@@ -73,6 +75,7 @@ impl Default for UiStateV1 {
             last_seen: BTreeMap::new(),
             workspace_cursor: None,
             interface_scale: None,
+            default_new_session_worktree: None,
             dismissed_collision_warning: None,
         }
     }
@@ -127,6 +130,13 @@ pub fn validate(state: &UiStateV1) -> Result<(), String> {
         bounded(runtime_id, "selected runtime id")?;
         total_string_bytes = total_string_bytes.saturating_add(runtime_id.len());
     }
+    if let Some(worktree) = &state.default_new_session_worktree {
+        bounded(worktree, "default new-session worktree")?;
+        if !Path::new(worktree).is_absolute() {
+            return Err("Default new-session worktree must be absolute".to_owned());
+        }
+        total_string_bytes = total_string_bytes.saturating_add(worktree.len());
+    }
     let mut total_draft_bytes = 0usize;
     for (runtime_id, draft) in &state.drafts {
         bounded(runtime_id, "draft runtime id")?;