feat: implement RoleBadge, GalleryForm, and GalleryTable admin components

[BigBen-7]

Summary

• Issue #33: Build the User Role Badge #163 — RoleBadge.tsx: Badge component for user roles (Super Admin, Admin, Manager, Staff) with distinct colors/icons; handles undefined role gracefully
• Issue #31: Build the Gallery Management Table #165 — GalleryTable.tsx: Admin gallery management table with thumbnail previews, inline visibility toggles, category filtering, pagination, edit/delete actions, and delete confirmation dialog
• Issue #30: Build the Gallery Image Form #166 — GalleryForm.tsx: Gallery image form with image upload, alt text, category select, display order input, and visibility toggle — validated with Zod + react-hook-form
• Issue #29: Build the Contact Details Modal #167 — ContactDetailsModal.tsx was already implemented (no changes needed)

Files changed

• frontend/app/components/admin/users/RoleBadge.tsx (new)
• frontend/app/components/admin/gallery/GalleryForm.tsx (new)
• frontend/app/components/admin/gallery/GalleryTable.tsx (new)

Test plan

• RoleBadge renders correct color/icon for each AdminRole value
• RoleBadge renders gray "Unknown" badge when role is undefined
• GalleryForm validates all fields (imageUrl required, alt min 5 chars, category enum, displayOrder min 0)
• GalleryForm shows spinner and "Saving…" while isSubmitting
• GalleryTable renders images with thumbnails, category pills, visibility toggles
• GalleryTable search and category filter work correctly
• GalleryTable edit button navigates to /admin/gallery/{id}
• GalleryTable delete opens confirmation dialog; success/error toasts fire correctly
• GalleryTable pagination appears when pageCount > 1

Closes #163
Closes #165
Closes #166
Closes #167

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