Persist sidebar menu group open/closed state in localStorage

[simonhamp]

Summary

• Adds an Alpine.js sidebarGroup component that persists the open/closed state of each expandable sidebar group (Community, Teams, Developer) to localStorage
• When the current page belongs to a group, that group is forced open regardless of saved state — without overwriting the user's preference
• Subsequent manual toggles by the user are persisted normally

Changes

• New: resources/js/alpine/sidebarGroup.js — Alpine data component using a MutationObserver on the Flux data-open attribute
• Modified: resources/js/app.js — imports and registers the new component
• Modified: resources/views/components/layouts/dashboard.blade.php — adds x-data="sidebarGroup('...')" to each expandable sidebar group

Test plan

• Open dashboard, expand/collapse sidebar groups, navigate away and back — state should be remembered
• Navigate to a page within a group (e.g. Showcase under Community) — group should auto-open even if previously saved as closed
• Verify that auto-opening for a current page does not overwrite the saved preference
• Clear localStorage and confirm groups default to collapsed

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