feat(books): add icon tooltips, book export, and bulk book actions

- add tooltips to all header icons (search, upload, appearance, settings, theme toggle, sidebar trigger)
- fix appearance popover by moving Tooltip outside Popover
- add POST /api/books/export endpoint to zip and download books
- add POST /api/books/bulk-refresh-metadata and bulk-re-extract-cover endpoints
- add BulkBookIdsDto and ExportBooksDto
- add archiver dependency for zip streaming
- update theme CSS variables and component styles across client

server/package.json

@@ -45,6 +45,8 @@
     "@nestjs/websockets": "^11.1.14",
     "@parcel/watcher": "^2.5.6",
     "@projectx/types": "workspace:*",
+    "@types/archiver": "^7.0.0",
+    "archiver": "^7.0.1",
     "bcryptjs": "^3.0.3",
     "cheerio": "^1.2.0",
     "class-transformer": "^0.5.1",
@@ -74,7 +76,7 @@
     "@nestjs/schematics": "^11.0.0",
     "@nestjs/testing": "^11.0.1",
     "@swc/cli": "^0.7.10",
-    "@swc/core": "^1.15.17",
+    "@swc/core": "^1.15.18",
     "@types/bcrypt": "^6.0.0",
     "@types/bcryptjs": "^3.0.0",
     "@types/express": "^5.0.0",