Bump frontend version to 0.2.0

Style fixes: timeline hover, page-header layout, toolbar sort icon ...

- Disable timeline-card hover background/transform
- Fix page-header-compact: overflow initial, content row layout
- Move sort dropdown out of toolbar into actions row
- Replace sort button label with icon-only GnIconButton

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

Refactor detail-header to GnPageHeader and remove obsolete card hover override ...

- Replace custom detail-header div with GnPageHeader component
- Remove custom .detail-header and .detail-title CSS
- Remove card:hover animation override (animations removed from UI kit)

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

Apply gnexus-ui-kit 0.4.0 improvements: GnCopyButton, GnTagInput, GnSwitch, GnConfirmDialog, GnTooltip, GnUserCard ...

- Replace manual copy logic with GnCopyButton in SecretDetailPanel
- Replace comma-separated tag input with GnTagInput (array-based)
- Replace access checkboxes with GnSwitch for better UX
- Replace custom confirm modals with GnConfirmDialog
- Add GnTooltip to reveal/hide/edit action icons
- Replace admin table with GnUserCard grid layout
- Replace error paragraphs with GnAlert components
- Remove copiedFieldKey and copyValue custom logic
- Update form tags handling from string to array

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

Update gnexus-ui-kit to 0.4.0 ...

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

Always set allow_mcp=true for secrets created through MCP tools ...

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

Fix MCP /mcp-protocol/ 421 error: disable DNS rebinding protection and fix SPA fallback ...

- Disable MCP SDK transport_security DNS rebinding protection (nginx handles it)
- Fix SPA fallback to exclude /mcp-protocol without trailing slash
- Add transport_security import to mcp_protocol.py

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

Production-ready rewrite: UI kit integration, admin backups, sorting, profile editing, and security hardening ...

- Frontend: complete rewrite using gnexus-ui-kit components (GnNavigationShell,
  GnTable, GnTimeline, GnModal, GnToastProvider, GnSkeleton, etc.)
- Frontend: browser route sync (/secrets/:id, /audit/:id), pagination,
  real-time search debounce, skeleton loading states, retry with backoff
- Frontend: profile editing modal, token creation with scope selection,
  import/export, settings metrics, admin users table
- Backend: backup/restore endpoints for PostgreSQL and SQLite via pg_dump/psql
- Backend: admin backup CRUD, file download endpoint
- Backend: stats endpoint, PATCH /me profile endpoint, CORS middleware,
  graceful shutdown logging
- Backend: table sorting (sort_by/sort_dir) in list_secrets
- Backend: OAuth return_to validation, rate limiting on sensitive endpoints
- MCP: validation fixes, tool description improvements, protocol cleanup
- Tests: 44 passing including new backup test suite
- Docker: add postgresql-client, backups volume, deployment docs
- Docs: backup/restore instructions in deployment guide

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

Add deployment and MCP connection guide

Improve MCP tool instructions

Hide unused tab panels

Compact header search

Remove workspace surface framing

Move search into page header

Add routes for secret detail pages

Sync tabs with browser routes

Split secrets list and detail views

Use table for secrets list

Show toast after copying values

Use dropdown for secret actions

Move metadata edit form to modal

Mask revealed fields by default

Improve modal close and revealed field actions

Remove form grid width cap

Improve create modal density and animation

Mask secret values before reveal

Reduce card-heavy frontend layout

Use gnexus ui kit across frontend

Align UI with gnexus ui kit components

Improve create secret modal UX