Add two new template components:
1. CollectionModal(collection CollectionData)
- Reusable modal for both creating and editing collections
- When collection.ID is empty: shows "Create Collection" form
- When collection.ID is set: shows "Edit Collection" form with pre-filled data
- Features:
* Name and description fields
* Icon picker with search input and emoji grid
(grid populated dynamically by JavaScript)
(supports typing emoji directly or searching by keywords)
* Color selection buttons (blue/red/yellow/green/purple)
* HTMX form submission (hx-post for create, hx-put for update)
- HX-Redirect to /collections after successful submission
2. RestoreSystemCollectionModal()
- Modal for restoring deleted system collections
- Dropdown with options: Continue Reading, Recently Added,
Recently Read, Not Started
- HTMX form submission to /api/dashboard/restore-system-collection
- HX-Redirect to /collections after restoration
Both modals:
- Use fixed inset-0 positioning with black/70 backdrop
- Inherit theme from parent page (no html/head/body tags)
- Include close button (✕) that calls closeCollectionModal()
- Follow existing card styling conventions
- Use CSS custom properties for theming (--bg-secondary, --text-primary, etc.)
