feat: photo/video capture-date pipeline + premium UI/UX overhaul

Backend — Photos timeline now groups by real capture date instead of upload time. New MediaMetadataService (FileLifecycleHook) extracts EXIF DateTimeOriginal from images and container creation_time from videos (mov/mp4/mkv) via nom-exif, timezone-correct (OffsetTimeOriginal), persisting captured_at so the existing media_sort_date trigger takes over. Adds POST /admin/photos/metadata/reextract to backfill existing media. Falls back to upload date when no embedded date exists.

Frontend — premium grid cards: combined metadata line (relative date · size, owner avatar when shared), custom selection checkbox with a clear checked state, uniform full-width 4:3 thumbnail tiles independent of filename length, centered file-type icons, and a hit-test fix so checkbox/star/kebab clicks reach the controls (the decorative thumbnail no longer captures pointer events). Notification messages internationalised across all 16 locales. Broader polish: design tokens, a11y/focus-visible states, brand + PWA assets.

Chore — bump semver-compatible dependencies (cargo upgrade); add nom-exif 3.6.1.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

static/locales/ko.json

@@ -157,7 +157,11 @@
         "close": "닫기",
         "delete_permanently": "영구 삭제",
         "empty_trash": "휴지통 비우기",
-        "open_parent_folder": "상위 폴더로 이동"
+        "open_parent_folder": "상위 폴더로 이동",
+        "add": "Add",
+        "apply": "Apply",
+        "clear": "Clear",
+        "remove": "Remove"
     },
     "user_menu": {
         "appearance": "외관",
@@ -197,7 +201,22 @@
         "shareCreated": "공유 링크가 성공적으로 생성되었습니다",
         "shareUpdated": "공유 설정이 성공적으로 업데이트되었습니다",
         "shareRemoved": "공유가 성공적으로 삭제되었습니다",
-        "inviteByEmail": "이메일로 초대 — 초대장이 전송됩니다"
+        "inviteByEmail": "이메일로 초대 — 초대장이 전송됩니다",
+        "directoryUnavailable": "User directory unavailable",
+        "linkNamePlaceholder": "Link name (optional)",
+        "newLink": "New link",
+        "noExpiry": "No expiry",
+        "pending": "Pending",
+        "people": "People",
+        "publicLinks": "Public links",
+        "role": {
+            "canEdit": "Can edit",
+            "canManage": "Can manage",
+            "canView": "Can view"
+        },
+        "searchPlaceholder": "Search people…",
+        "shareOf": "Share of:",
+        "sharedLink": "Shared link"
     },
     "share_dialogTitle": "공유 링크",
     "share_linkLabel": "공유 링크:",
@@ -460,7 +479,10 @@
         "magicLinkSubmit": "로그인 링크 보내기",
         "magicLinkSent": "해당 이메일에 대한 계정이 있는 경우 로그인 링크가 전송되었습니다. 받은편지함을 확인하세요.",
         "magicLinkUnavailable": "이 서버에서는 이메일 로그인을 사용할 수 없습니다.",
-        "magicLinkNetworkError": "서버에 연결할 수 없습니다: {{message}}"
+        "magicLinkNetworkError": "서버에 연결할 수 없습니다: {{message}}",
+        "magicLinkToggle": "No password? Email me a sign-in link",
+        "passwordsMatch": "Passwords match",
+        "capsLock": "Caps Lock is on"
     },
     "storage": {
         "title": "저장소",
@@ -881,5 +903,78 @@
         "notifyRateLimited": "이 수신자에게 알림이 너무 많습니다 — 나중에 다시 시도하세요.",
         "removeAccess": "액세스 제거",
         "resendInvitation": "초대 이메일 다시 보내기"
+    },
+    "sort": {
+        "asc": "ascending",
+        "desc": "descending"
+    },
+    "notif": {
+        "errorTitle": "Error",
+        "searchError": "Error performing search",
+        "cleanupCompleted": "Cleanup completed",
+        "cleanupCompletedBody": "Recent files history has been cleared",
+        "batchCopy": "Batch copy",
+        "batchCopyBody": "{{success}} copied, {{errors}} failed",
+        "itemsCopied": "Items copied",
+        "itemsCopiedBody": "{{count}} items copied successfully",
+        "batchMove": "Batch move",
+        "batchMoveBody": "{{success}} moved, {{errors}} failed",
+        "itemsMoved": "Items moved",
+        "itemsMovedBody": "{{count}} items moved successfully",
+        "batchDelete": "Batch delete",
+        "batchDeleteBody": "{{success}} moved to trash, {{errors}} failed",
+        "movedToTrash": "Moved to trash",
+        "movedToTrashBody": "{{count}} items moved to trash",
+        "trashItemsError": "Could not move items to trash",
+        "preparingDownload": "Preparing download",
+        "preparingDownloadBody": "Preparing your download…",
+        "downloadItemsError": "Could not download selected items",
+        "favoritesAddError": "Could not add items to favorites",
+        "invalidEmail": "Please enter a valid email address",
+        "notificationSendError": "Could not send notification",
+        "folderCreated": "Folder created",
+        "folderCreatedBody": "\"{{name}}\" created successfully",
+        "fileMoved": "File moved",
+        "fileMovedBody": "File moved successfully",
+        "fileMoveError": "Error moving the file: {{error}}",
+        "fileMoveErrorGeneric": "Error moving the file",
+        "folderMoved": "Folder moved",
+        "folderMovedBody": "Folder moved successfully",
+        "folderMoveError": "Error moving the folder: {{error}}",
+        "folderMoveErrorGeneric": "Error moving the folder",
+        "fileCopied": "File copied",
+        "fileCopiedBody": "File copied successfully",
+        "fileCopyError": "Error copying the file: {{error}}",
+        "fileCopyErrorGeneric": "Error copying the file",
+        "folderRenamed": "Folder renamed",
+        "folderRenamedBody": "Folder renamed to \"{{name}}\"",
+        "fileTrashed": "File moved to trash",
+        "fileTrashedBody": "\"{{name}}\" moved to trash",
+        "fileDeleted": "File deleted",
+        "fileDeletedBody": "\"{{name}}\" deleted successfully",
+        "fileDeleteError": "Error deleting the file",
+        "folderTrashed": "Folder moved to trash",
+        "folderTrashedBody": "\"{{name}}\" moved to trash",
+        "folderDeleted": "Folder deleted",
+        "folderDeletedBody": "\"{{name}}\" deleted successfully",
+        "folderDeleteError": "Error deleting the folder",
+        "itemRestored": "Item restored",
+        "itemRestoredBody": "Item restored successfully",
+        "itemRestoreError": "Error restoring the item",
+        "itemDeleted": "Item deleted",
+        "itemDeletedBody": "Item permanently deleted",
+        "itemDeleteError": "Error deleting the item",
+        "trashEmptied": "Trash emptied",
+        "trashEmptiedBody": "The trash has been emptied successfully",
+        "trashEmptyError": "Error emptying the trash",
+        "cacheCleared": "Cache cleared",
+        "cacheClearedBody": "Search cache cleared successfully",
+        "cacheClearError": "Error clearing search cache",
+        "wopiOpenError": "Could not open the document editor.",
+        "linkCopied": "Link copied",
+        "linkCopiedBody": "Link copied to clipboard",
+        "linkCopyError": "Could not copy link",
+        "notificationSent": "Notification sent",
+        "notificationSentBody": "Notification sent to {{email}}"
     }
 }