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/app_tab.dart

@@ -0,0 +1,47 @@
+import 'package:flutter/material.dart';
+import 'package:material_symbols_icons/symbols.dart';
+
+/// Every destination the bottom nav bar can show. Order here is only the
+/// fallback default — actual order/visibility/default-tab are user
+/// configurable and persisted in [ServerProvider].
+enum AppTab { files, photos, activity, trash, shares, recent }
+
+/// At most this many tabs may be visible in the bottom nav bar at once —
+/// the rest are reachable through the "more" dropdown instead.
+const int maxVisibleTabs = 5;
+
+extension AppTabInfo on AppTab {
+  String get label {
+    switch (this) {
+      case AppTab.files:
+        return 'Files';
+      case AppTab.photos:
+        return 'Photos';
+      case AppTab.activity:
+        return 'Activity';
+      case AppTab.trash:
+        return 'Trash';
+      case AppTab.shares:
+        return 'Shares';
+      case AppTab.recent:
+        return 'Recent';
+    }
+  }
+
+  IconData get icon {
+    switch (this) {
+      case AppTab.files:
+        return Icons.folder_rounded;
+      case AppTab.photos:
+        return Icons.photo_library_rounded;
+      case AppTab.activity:
+        return Icons.electric_bolt_rounded;
+      case AppTab.trash:
+        return Icons.delete_outline_rounded;
+      case AppTab.shares:
+        return Icons.groups_rounded;
+      case AppTab.recent:
+        return Symbols.search_activity_rounded;
+    }
+  }
+}

lib/models/nextcloud_file_version.dart

@@ -0,0 +1,16 @@
+/// One entry in a file's version history (Nextcloud's DAV versions API).
+class NextcloudFileVersion {
+  /// The timestamp segment used in the DAV versions/restore URLs, e.g.
+  /// `1699999999`.
+  final String versionLabel;
+  final DateTime timestamp;
+  final int size;
+  final bool isCurrent;
+
+  const NextcloudFileVersion({
+    required this.versionLabel,
+    required this.timestamp,
+    required this.size,
+    this.isCurrent = false,
+  });
+}

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,
     );
   }
 

lib/models/nextcloud_share.dart

@@ -0,0 +1,42 @@
+import 'nextcloud_item.dart';
+
+enum ShareType { user, group, publicLink, email, federated, other }
+
+/// A Nextcloud OCS share — either something the current user has shared
+/// with someone else, or something someone else has shared with them
+/// (distinguished by [sharedWithMe]).
+class NextcloudShare {
+  final String id;
+  final String path;
+  final String name;
+  final NextcloudItemType itemType;
+  final ShareType shareType;
+  final String ownerDisplayName;
+  final String? sharedWithDisplayName;
+  final DateTime sharedAt;
+  final bool sharedWithMe;
+
+  /// Only set for public-link shares.
+  final String? url;
+  final int permissions;
+  final String? token;
+  final DateTime? expireDate;
+
+  const NextcloudShare({
+    required this.id,
+    required this.path,
+    required this.name,
+    required this.itemType,
+    required this.shareType,
+    required this.ownerDisplayName,
+    this.sharedWithDisplayName,
+    required this.sharedAt,
+    required this.sharedWithMe,
+    this.url,
+    this.permissions = 1,
+    this.token,
+    this.expireDate,
+  });
+
+  bool get isFolder => itemType == NextcloudItemType.folder;
+}

lib/models/nextcloud_sharee.dart

@@ -0,0 +1,30 @@
+/// One result from a sharee search (`/ocs/.../sharees`) — a user or team
+/// (group) that a file/folder can be shared with.
+enum ShareeType { user, group, remote }
+
+class NextcloudSharee {
+  final String shareWith;
+  final String label;
+  final ShareeType type;
+  final String? subtitle;
+
+  const NextcloudSharee({
+    required this.shareWith,
+    required this.label,
+    required this.type,
+    this.subtitle,
+  });
+
+  /// The numeric OCS `shareType` used when creating a share with this
+  /// sharee (0 = user, 1 = group, 6 = federated/remote).
+  int get shareTypeValue {
+    switch (type) {
+      case ShareeType.user:
+        return 0;
+      case ShareeType.group:
+        return 1;
+      case ShareeType.remote:
+        return 6;
+    }
+  }
+}

lib/models/selection_action.dart

@@ -0,0 +1,18 @@
+import 'package:flutter/material.dart';
+
+/// One bulk action available for the current multi-selection (e.g. favorite,
+/// download, delete), shown as an icon button in the sticky selection
+/// toolbar each tab (Files, Photos, ...) renders inline in its own content.
+class SelectionAction {
+  final IconData icon;
+  final String label;
+  final Color? color;
+  final VoidCallback onTap;
+
+  const SelectionAction({
+    required this.icon,
+    required this.label,
+    required this.onTap,
+    this.color,
+  });
+}