fix(02): wire calendar-controls plugin and Zustand selectors

Bug A — navigation no-op: replace $app.calendarState private-API poking
with the official @schedule-x/calendar-controls plugin. CalendarShell
creates the plugin once via useState stable initialiser and passes it to
ViewToolbar as `controls`. ViewToolbar calls controls.setDate(PlainDate)
and controls.setView(id) for all navigation and view-switching. Step size
matches the active view: day→±1 day, week→±1 week, month-*→±1 month.

Bug B — popover-open calendar flash: replace the unselected
useCalendarStore() destructuring in CalendarShell and ViewToolbar with
per-field selectors. Neither component now subscribes to openEventId, so
popover open/close no longer triggers a re-render that rebuilds the
Schedule-X config.

- Add @schedule-x/calendar-controls@4.6.0 dependency
- Update CalendarShell.test.tsx: add vi.mock for calendar-controls
- typecheck, vitest (37/37), build all pass

pnpm-lock.yaml

@@ -62,6 +62,9 @@ importers:
       '@schedule-x/calendar':
         specifier: 4.6.0
         version: 4.6.0(@preact/signals@2.9.1(preact@10.29.2))(preact@10.29.2)(temporal-polyfill@0.3.2)
+      '@schedule-x/calendar-controls':
+        specifier: 4.6.0
+        version: 4.6.0
       '@schedule-x/event-modal':
         specifier: 4.6.0
         version: 4.6.0(@preact/signals@2.9.1(preact@10.29.2))(preact@10.29.2)
@@ -863,6 +866,9 @@ packages:
   '@rolldown/pluginutils@1.0.1':
     resolution: {integrity: sha512-2j9bGt5Jh8hj+vPtgzPtl72j0yRxHAyumoo6TNfAjsLB04UtpSvPbPcDcBMxz7n+9CYB0c1GxQFxYRg2jimqGw==}
 
+  '@schedule-x/calendar-controls@4.6.0':
+    resolution: {integrity: sha512-+VVmJ4AhZkAqTsz/U6L6mftuohBXSdJ10/HFWoMrO5coaoj0K5MExCdcG7UkFK3ZmoPz03koO0RnqRt5FKyXsg==}
+
   '@schedule-x/calendar@4.6.0':
     resolution: {integrity: sha512-8Rf5bUf0DVphJB2BaudtG4IHkw21wgMJiiuk5o+7SIOq6YH4hkVJo+Kk12pWSfp2KTZ9mnnUuLV+szBVhiEPlg==}
     peerDependencies:
@@ -2271,6 +2277,8 @@ snapshots:
 
   '@rolldown/pluginutils@1.0.1': {}
 
+  '@schedule-x/calendar-controls@4.6.0': {}
+
   '@schedule-x/calendar@4.6.0(@preact/signals@2.9.1(preact@10.29.2))(preact@10.29.2)(temporal-polyfill@0.3.2)':
     dependencies:
       '@preact/signals': 2.9.1(preact@10.29.2)