feat: unified shell, diagnostics pack, native Office, sticky board

Make Surface remote debugging and classroom workflows viable: always-on
structured logs with one-click zip export, a single AppShell chrome,
OOXML PPTX/DOCX annotation without LibreOffice, and a first-class sticky
board. Also drop spike/legacy ink widgets and tighten pen feel
(predictor, PenInfoHistory, page-tile layer).

Co-authored-by: Cursor <cursoragent@cursor.com>

lib/l10n/app_en.arb

@@ -121,6 +121,18 @@
       "total": { "type": "int" }
     }
   },
+  "libraryTab": "Library",
+  "boardTab": "Stickies",
+  "shellTagline": "Ink · Annotate · Know",
+  "notesSection": "Notes",
+  "documentsSection": "Documents",
+  "emptyLibraryTitle": "Nothing here yet",
+  "emptyLibraryBody": "Create a note, or import PDF / PPT / Word",
+  "diagnosticsSection": "Diagnostics",
+  "diagnosticsExport": "Export diagnostic pack",
+  "diagnosticsExportHint": "Reproduce on Surface, export, and send the zip back",
+  "diagnosticsToggle": "Input diagnostics overlay",
+  "penSettingsUnified": "Pen & ink",
   "board": "Board",
   "boardTitle": "Sticky Board",
   "boardOpen": "Sticky note board",

lib/l10n/app_localizations.dart

@@ -644,6 +644,78 @@ abstract class AppLocalizations {
   /// **'{current} / {total}'**
   String pageOfPages(int current, int total);
 
+  /// No description provided for @libraryTab.
+  ///
+  /// In en, this message translates to:
+  /// **'Library'**
+  String get libraryTab;
+
+  /// No description provided for @boardTab.
+  ///
+  /// In en, this message translates to:
+  /// **'Stickies'**
+  String get boardTab;
+
+  /// No description provided for @shellTagline.
+  ///
+  /// In en, this message translates to:
+  /// **'Ink · Annotate · Know'**
+  String get shellTagline;
+
+  /// No description provided for @notesSection.
+  ///
+  /// In en, this message translates to:
+  /// **'Notes'**
+  String get notesSection;
+
+  /// No description provided for @documentsSection.
+  ///
+  /// In en, this message translates to:
+  /// **'Documents'**
+  String get documentsSection;
+
+  /// No description provided for @emptyLibraryTitle.
+  ///
+  /// In en, this message translates to:
+  /// **'Nothing here yet'**
+  String get emptyLibraryTitle;
+
+  /// No description provided for @emptyLibraryBody.
+  ///
+  /// In en, this message translates to:
+  /// **'Create a note, or import PDF / PPT / Word'**
+  String get emptyLibraryBody;
+
+  /// No description provided for @diagnosticsSection.
+  ///
+  /// In en, this message translates to:
+  /// **'Diagnostics'**
+  String get diagnosticsSection;
+
+  /// No description provided for @diagnosticsExport.
+  ///
+  /// In en, this message translates to:
+  /// **'Export diagnostic pack'**
+  String get diagnosticsExport;
+
+  /// No description provided for @diagnosticsExportHint.
+  ///
+  /// In en, this message translates to:
+  /// **'Reproduce on Surface, export, and send the zip back'**
+  String get diagnosticsExportHint;
+
+  /// No description provided for @diagnosticsToggle.
+  ///
+  /// In en, this message translates to:
+  /// **'Input diagnostics overlay'**
+  String get diagnosticsToggle;
+
+  /// No description provided for @penSettingsUnified.
+  ///
+  /// In en, this message translates to:
+  /// **'Pen & ink'**
+  String get penSettingsUnified;
+
   /// No description provided for @board.
   ///
   /// In en, this message translates to:

lib/l10n/app_localizations_en.dart

@@ -301,6 +301,43 @@ class AppLocalizationsEn extends AppLocalizations {
     return '$current / $total';
   }
 
+  @override
+  String get libraryTab => 'Library';
+
+  @override
+  String get boardTab => 'Stickies';
+
+  @override
+  String get shellTagline => 'Ink · Annotate · Know';
+
+  @override
+  String get notesSection => 'Notes';
+
+  @override
+  String get documentsSection => 'Documents';
+
+  @override
+  String get emptyLibraryTitle => 'Nothing here yet';
+
+  @override
+  String get emptyLibraryBody => 'Create a note, or import PDF / PPT / Word';
+
+  @override
+  String get diagnosticsSection => 'Diagnostics';
+
+  @override
+  String get diagnosticsExport => 'Export diagnostic pack';
+
+  @override
+  String get diagnosticsExportHint =>
+      'Reproduce on Surface, export, and send the zip back';
+
+  @override
+  String get diagnosticsToggle => 'Input diagnostics overlay';
+
+  @override
+  String get penSettingsUnified => 'Pen & ink';
+
   @override
   String get board => 'Board';
 

lib/l10n/app_localizations_zh.dart

@@ -300,6 +300,42 @@ class AppLocalizationsZh extends AppLocalizations {
     return '$current / $total';
   }
 
+  @override
+  String get libraryTab => '库';
+
+  @override
+  String get boardTab => '便利贴';
+
+  @override
+  String get shellTagline => '手写 · 批注 · 知识';
+
+  @override
+  String get notesSection => '笔记';
+
+  @override
+  String get documentsSection => '文档';
+
+  @override
+  String get emptyLibraryTitle => '还没有内容';
+
+  @override
+  String get emptyLibraryBody => '新建笔记，或导入 PDF / PPT / Word';
+
+  @override
+  String get diagnosticsSection => '诊断';
+
+  @override
+  String get diagnosticsExport => '导出诊断包';
+
+  @override
+  String get diagnosticsExportHint => '在 Surface 上复现问题后导出，发回给开发者分析';
+
+  @override
+  String get diagnosticsToggle => '输入诊断叠加层';
+
+  @override
+  String get penSettingsUnified => '笔与墨迹';
+
   @override
   String get board => '便利贴板';
 

lib/l10n/app_zh.arb

@@ -97,6 +97,18 @@
   "failedToOpenPdf": "打开 PDF 失败：\n{error}",
   "pdfNoPages": "PDF 没有任何页面。",
   "pageOfPages": "{current} / {total}",
+  "libraryTab": "库",
+  "boardTab": "便利贴",
+  "shellTagline": "手写 · 批注 · 知识",
+  "notesSection": "笔记",
+  "documentsSection": "文档",
+  "emptyLibraryTitle": "还没有内容",
+  "emptyLibraryBody": "新建笔记，或导入 PDF / PPT / Word",
+  "diagnosticsSection": "诊断",
+  "diagnosticsExport": "导出诊断包",
+  "diagnosticsExportHint": "在 Surface 上复现问题后导出，发回给开发者分析",
+  "diagnosticsToggle": "输入诊断叠加层",
+  "penSettingsUnified": "笔与墨迹",
   "board": "便利贴板",
   "boardTitle": "便利贴板",
   "boardOpen": "便利贴板",