feat: transfers approval inbox with pending/requests/history and notifications center

[BashMan11]

Summary

This PR implements the transfers approval inbox and notifications center.

Changes

[FE-08] Transfers Approval Inbox

• Replaced mock transfers page with full-featured approval workflow
• Pending tab (MANAGER/ADMIN): shows pending requests with Approve/Reject actions; reject requires a reason
• My Requests tab (all users): shows own requests with Cancel action while pending
• History tab: shows decided requests with status and rejection reasons
• Role-gated: approval actions only visible to managers/admins

[FE-09] Notifications Center

• New /notifications page with paginated notification list
• Unread/filtered views with toggle
• Mark-as-read on click, mark-all-read button
• Notification links to related resources (assets, transfers, maintenance)
• Type indicators (INFO/WARNING/ALERT) with color-coded icons
• Bell icon added to sidebar navigation

Verification

• Transfers page follows existing patterns with role-based UI
• Notifications page uses standard list/filter pattern
• Sidebar updated with new navigation entries
• Empty states designed for both pages

Closes #1100
Closes #1101
Closes #1102
Closes #1103

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[yusuftomilola]

Reviewed. Solid rework of the transfers page — replaces the old inline-styled placeholder with a proper Pending/My Requests/History tabbed inbox, approve/reject-with-reason/cancel actions, and a pending-count badge. New notifications page has sensible unread filtering and mark-all-read. Both are local-state/mock-data only for now (no backend calls), consistent with how my-assets/custom-fields in #1362 handled similar not-yet-wired pages — nothing here claims a persisted action that didn't happen. Worth a fast follow-up to wire these to the real /transfers and a notifications endpoint now that the backend guards are in place from #1363.

Approving.