spb/spb-cloud

- tokens sémantiques + 7 accents dynamiques, Geist local, thème système, densité, mouvement réduit
- barre latérale rail, TopBar fil d Ariane, MobileTabBar, CommandPalette, PreferencesModal
- explorateur : tri par colonnes, sélection plage, menu contextuel, clavier, glisser-déposer (bureau, dossiers, arbre, miettes), deep links ?file/?upload/?new
- aperçu plein écran réel + swipe ; pages secondaires, admin, partage public, AiPanel restylés
- accueil : donut par catégorie, activité 14 j, KPI ; /api/admin/stats enrichi
- fixes : recherche 500 (mode insensitive SQLite), rate limit 600 + médias exemptés, /raw → preview, route /admin/snapshots, .gitignore snapshots ancré, SNAPSHOT_DISABLED

UI improvements:
- ExcelPreview: white Excel-like design (green tabs, gray headers), inline cell editing, XLSX save
- WordPreview: Tiptap rich text editor for edit mode, html-docx-js save as .docx
- PdfPreview: persistent SVG annotation overlay (highlight/note/pen) saved to DB
- FileCard: tag color dots, favorite star, colored bg per file type, relative dates

Layout fixes:
- AppShell: h-screen overflow-hidden for sticky sidebar, h-full on columns
- PreviewEngine: lg:left-64 offset in fullscreen to clear sidebar
- WordTiptapEditor: absolute inset-0 layout so toolbar stays visible in fullscreen
- Navigation arrows hidden while editing

AI fixes:
- /api/ai/files: fix session reading (NextResponse.next → new NextResponse), add try/catch
- /api/ai/chat: buildFileBlocks now async; adds Word (mammoth) and Excel (xlsx) extraction
- AiPanel: MarkdownContent component with remark-gfm + react-syntax-highlighter (Prism)

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

Multi-user system with roles (admin/user/viewer), TOTP 2FA authentication,
AI-powered search/chat/OCR/auto-tagging via Claude Sonnet 4.5, AES-256
encrypted storage, backup system, notification system, REST API with
API keys, bulk file operations, folder ZIP download, light/dark theme,
and mobile-first responsive design.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>