fix(calendar): restore week navigation for saved week view

[Keegil]

Bug fix — Previous/Next navigation in the calendar advances by month instead of week when the saved view preference is Week.

Problem

When a user's calendar view preference was saved as Week, the toolbar's Previous/Next buttons navigated by month instead of week after the app reloaded. The Angular Calendar directive mwlView stayed at its default Month value because setView() only updated it when the stored preference changed — it did not apply the initial restored value. Issue #1541.

Root cause

setView() compared the new value against the current view property. When the app restored lastUsedView = Week from preferences, view became Week, but since setView() treated this as "no change", mwlView was never updated from its default Month. The toolbar directives read mwlView for navigation step size, so all navigation used month steps.

Fix

• Synchronise mwlView whenever the calendar view is restored from preferences or changed by the user
• Ensure the initial preference restoration sets both view and mwlView consistently

Testing

• Regression spec added: restores week view from preferences and verifies the Next button advances by one week
• npm run lint passes (existing repo-wide warnings only)

Closes #1541

[Keegil]

Updated this to keep setView() unchanged and instead restore the saved calendar view directly from preferences, plus removed the changes.ts update. I also re-ran a TypeScript compile check locally.