fix: improve OpenCode settings handling

Improves OpenCode CLI and shortcut settings flows
Updates runtime API and persistence handling
Adds coverage for settings helper behavior

packages/ui/src/lib/api/types.ts

@@ -648,6 +648,8 @@ export interface SettingsPayload {
   queueModeEnabled?: boolean;
   gitmojiEnabled?: boolean;
   inputSpellcheckEnabled?: boolean;
+  showOpenCodeUpdateNotifications?: boolean;
+  openCodeUpdateToastDismissedVersion?: string;
   showToolFileIcons?: boolean;
   showExpandedBashTools?: boolean;
   showExpandedEditTools?: boolean;
@@ -663,6 +665,7 @@ export interface SettingsPayload {
   padding?: number;
   cornerRadius?: number;
   inputBarOffset?: number;
+  shortcutOverrides?: Record<string, string>;
   diffLayoutPreference?: 'dynamic' | 'inline' | 'side-by-side';
   diffViewMode?: 'single' | 'stacked';
   gitChangesViewMode?: 'flat' | 'tree';