Add Trash/Shares/Recent tabs, file sharing, Details sheet, and rebrand to Noo

Major additions since the initial rebuild:
- New tabs: Trash, Shares, Recent, configurable tab visibility/order/default
- Nextcloud sharing: search users/teams, internal link, email shares,
  public links, "others with access" - in its own Share bottom sheet
- Details bottom sheet (Info/Versions/Activity) with a persistent peek
  panel in the media viewer, reachable from selection, swipe, and the
  media viewer
- Files/Photos: tap-and-hold multi-select with a sticky selection toolbar,
  swipe actions (favorite/delete/share), sticky sort/filter controls,
  list/grid views, breadcrumb chips, whole-account Photos view
- Media viewer: pinch/double-tap zoom on images, predictive-back support,
  fixed PDF zoom-out floor
- Settings: Material You theming incl. AMOLED black, configurable bottom
  bar tabs, swipe actions, media seek bar style, and folder-listing cache
  policy (never/periodic/manual) to cut down on refetching
- Login flow moved to an in-app Chrome Custom Tab with retry-tolerant
  polling
- Replaced ad hoc widgets with native Material 3 equivalents (toggle
  IconButtons, SliverAppBar selection toolbar, SearchBar, drag handles)
- Rebrand: app renamed to Noo throughout, package id -> dev.ayushya.noo,
  new adaptive launcher icon

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>

lib/models/nextcloud_item.dart

@@ -18,6 +18,11 @@ class NextcloudItem {
   final int? imageHeight;
   final String? mountType;
 
+  /// Trash-bin items only: the folder path the item was deleted from, and
+  /// when it was deleted. Null for items fetched from a regular directory.
+  final String? originalLocation;
+  final DateTime? deletedAt;
+
   const NextcloudItem({
     required this.id,
     required this.name,
@@ -33,6 +38,8 @@ class NextcloudItem {
     this.imageWidth,
     this.imageHeight,
     this.mountType,
+    this.originalLocation,
+    this.deletedAt,
   }) : dateCreated = dateCreated ?? lastModified;
 
   bool get isFolder => type == NextcloudItemType.folder;
@@ -55,6 +62,8 @@ class NextcloudItem {
     int? imageWidth,
     int? imageHeight,
     String? mountType,
+    String? originalLocation,
+    DateTime? deletedAt,
   }) {
     return NextcloudItem(
       id: id ?? this.id,
@@ -71,6 +80,8 @@ class NextcloudItem {
       imageWidth: imageWidth ?? this.imageWidth,
       imageHeight: imageHeight ?? this.imageHeight,
       mountType: mountType ?? this.mountType,
+      originalLocation: originalLocation ?? this.originalLocation,
+      deletedAt: deletedAt ?? this.deletedAt,
     );
   }