feat(FN-3334): add auto-reload setting and fix worktree project resolution

Merged two features: FN-3334 introduces a new `autoReloadOnVersionChange` setting with a toggle in the Settings modal, version-check logic in the dashboard, and corresponding tests; FN-3335 fixes worktree project root resolution in `createFnAgent` and the skill resolver, with tests for both paths. S

Fusion-Task-Id: FN-3334

packages/core/src/settings-schema.ts

@@ -48,6 +48,7 @@ export const DEFAULT_GLOBAL_SETTINGS = {
   updateCheckEnabled: true,
   fnBinaryCheckEnabled: true,
   updateCheckFrequency: "daily",
+  autoReloadOnVersionChange: true,
   showGitHubStarButton: true,
   modelOnboardingComplete: undefined,
   useClaudeCli: undefined,

packages/core/src/types.ts

@@ -1365,6 +1365,11 @@ export interface GlobalSettings {
    *  - `weekly`: 7-day cache TTL
    */
   updateCheckFrequency?: "manual" | "on-startup" | "daily" | "weekly";
+  /** When true (default), the dashboard automatically reloads when a new build
+   *  version is detected via /version.json polling or service worker activation.
+   *  Set to false to suppress automatic reloads — the user must manually
+   *  refresh to pick up updates. */
+  autoReloadOnVersionChange?: boolean;
   /** When true, indicates the user has completed the AI model onboarding flow
    *  (connected at least one provider and selected a default model). When
    *  false/undefined, the dashboard will auto-open the onboarding modal.