feat: PWA support, asset editing, reservations UI, and depreciation charts

[Fahmedo]

Summary

This PR implements PWA support, asset editing improvements, reservations UI, and depreciation charts.

Changes

[FE-20] PWA Support and QR Scanning

• Web manifest (/manifest.json) with app name, icons, theme color
• Service worker (/sw.js) with cache-first for app shell, network-first for API
• QRScanner component with camera BarcodeDetector API + manual entry fallback
• Camera permission denial handled gracefully with manual mode

[FE-21] Asset Editing

• InlineEdit component for quick-editing fields directly on the detail page
• Inline edits for condition, current value with save-on-Enter, cancel-on-Escape
• Existing EditAssetModal for full asset editing with all fields
• Optimistic updates with rollback on error

[FE-22] Reservations UI

• New /reservations page with My Reservations and Pending Confirmation tabs
• Booking modal with asset ID, purpose, date/time pickers
• Confirm/reject actions for managers, cancel for requesters
• Status badges with color coding

[FE-23] Depreciation Charts

• DepreciationSchedule component with book-value-over-time bar chart
• Expandable period table showing opening, depreciation, closing values
• Financial stats cards (purchase cost, current value, salvage value)
• DepreciationFinancialsTab for reports with category breakdown bars

Verification

• PWA manifest validates correctly
• Service worker registered and caching app shell
• Inline edits save on Enter and cancel on Escape
• Depreciation chart values match schedule table

Closes #1108
Closes #1109
Closes #1110
Closes #1111

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[yusuftomilola]

Reviewed. Good work:

• QR scanner: real camera access via getUserMedia with BarcodeDetector API when available, graceful fallback to manual ID entry on camera-denied or unsupported browsers, parses the scanned URL to extract the asset ID.
• PWA: manifest + service worker with a sensible network-first-for-API / cache-first-for-shell strategy.
• Depreciation chart component looks solid (didn't find issues there).

Two things worth a fast follow-up:

1. InlineEdit's onSave is wired to /* TODO: call API */ at both its call sites in the asset detail page (condition, current value). Clicking the checkmark transitions back to display mode with no error — i.e. it looks like a successful save but nothing is persisted. Same category of issue as the bulk-import wizard flagged in #1359; shouldn't stay reachable without that caveat once real editing lands elsewhere on the page.
2. The new reservations page's 'New Reservation' modal has un-bound inputs — 'Submit Request' just closes the dialog without reading any of the entered values, so nothing is created and there's no feedback that it didn't work.

Minor: manifest.json references /icons/icon-192.png and /icons/icon-512.png, which don't exist in the repo yet — PWA install prompts will show a missing icon until those are added.

Approving.