feat: add session export with full and compressed modes (#507)

Add export functionality that allows users to download session data
as JSON or plain text, with optional LLM-based context compression
for long conversations. Includes UI controls in chat panel, session
list, and history view, plus i18n strings for all 8 locales.

Co-authored-by: Claude Opus 4.7 <noreply@anthropic.com>

packages/client/src/i18n/locales/de.ts

@@ -151,6 +151,12 @@ export default {
     monitorRoleUser: 'Benutzer',
     monitorRoleAssistant: 'Assistent',
     copySessionId: 'Sitzungs-ID kopieren',
+    export: 'Exportieren',
+    exportFull: 'Vollständiger Export (JSON)',
+    exportCompressed: 'Komprimierter Export (TXT)',
+    exportCompressing: 'Komprimiere Kontext, bitte warten...',
+    exportSuccess: 'Sitzung exportiert',
+    exportFailed: 'Export fehlgeschlagen',
     renamed: 'Umbenannt',
     renameFailed: 'Umbenennung fehlgeschlagen',
     renameSession: 'Sitzung umbenennen',

packages/client/src/i18n/locales/en.ts

@@ -174,6 +174,12 @@ export default {
     monitorRoleUser: 'User',
     monitorRoleAssistant: 'Assistant',
     copySessionId: 'Copy Session ID',
+    export: 'Export',
+    exportFull: 'Full Export (JSON)',
+    exportCompressed: 'Compressed Export (TXT)',
+    exportCompressing: 'Compressing context, please wait...',
+    exportSuccess: 'Session exported',
+    exportFailed: 'Export failed',
     renamed: 'Renamed',
     renameFailed: 'Rename failed',
     renameSession: 'Rename Session',

packages/client/src/i18n/locales/es.ts

@@ -151,6 +151,12 @@ export default {
     monitorRoleUser: 'Usuario',
     monitorRoleAssistant: 'Asistente',
     copySessionId: 'Copiar ID de sesión',
+    export: 'Exportar',
+    exportFull: 'Exportación completa (JSON)',
+    exportCompressed: 'Exportación comprimida (TXT)',
+    exportCompressing: 'Comprimiendo contexto, espere...',
+    exportSuccess: 'Sesión exportada',
+    exportFailed: 'Error al exportar',
     renamed: 'Renombrada',
     renameFailed: 'Error al renombrar',
     renameSession: 'Renombrar sesion',

packages/client/src/i18n/locales/fr.ts

@@ -151,6 +151,12 @@ export default {
     monitorRoleUser: 'Utilisateur',
     monitorRoleAssistant: 'Assistant',
     copySessionId: "Copier l'ID de session",
+    export: 'Exporter',
+    exportFull: 'Export complet (JSON)',
+    exportCompressed: 'Export compressé (TXT)',
+    exportCompressing: 'Compression du contexte, veuillez patienter...',
+    exportSuccess: 'Session exportée',
+    exportFailed: "Échec de l'export",
     renamed: 'Renomme',
     renameFailed: 'Echec du renommage',
     renameSession: 'Renommer la session',

packages/client/src/i18n/locales/ja.ts

@@ -151,6 +151,12 @@ export default {
     monitorRoleUser: 'ユーザー',
     monitorRoleAssistant: 'アシスタント',
     copySessionId: 'セッション ID をコピー',
+    export: 'エクスポート',
+    exportFull: 'フルエクスポート (JSON)',
+    exportCompressed: '圧縮エクスポート (TXT)',
+    exportCompressing: 'コンテキストを圧縮中、お待ちください...',
+    exportSuccess: 'セッションをエクスポートしました',
+    exportFailed: 'エクスポートに失敗しました',
     renamed: '名前を変更しました',
     renameFailed: '名前の変更に失敗しました',
     renameSession: 'セッション名の変更',

packages/client/src/i18n/locales/ko.ts

@@ -151,6 +151,12 @@ export default {
     monitorRoleUser: '사용자',
     monitorRoleAssistant: '어시스턴트',
     copySessionId: '세션 ID 복사',
+    export: '내보내기',
+    exportFull: '전체 내보내기 (JSON)',
+    exportCompressed: '압축 내보내기 (TXT)',
+    exportCompressing: '컨텍스트 압축 중, 잠시 기다려주세요...',
+    exportSuccess: '세션을 내보냈습니다',
+    exportFailed: '내보내기 실패',
     renamed: '이름이 변경되었습니다',
     renameFailed: '이름 변경 실패',
     renameSession: '세션 이름 변경',

packages/client/src/i18n/locales/pt.ts

@@ -151,6 +151,12 @@ export default {
     monitorRoleUser: 'Usuário',
     monitorRoleAssistant: 'Assistente',
     copySessionId: 'Copiar ID da sessão',
+    export: 'Exportar',
+    exportFull: 'Exportação completa (JSON)',
+    exportCompressed: 'Exportação comprimida (TXT)',
+    exportCompressing: 'Comprimindo contexto, aguarde...',
+    exportSuccess: 'Sessão exportada',
+    exportFailed: 'Falha ao exportar',
     renamed: 'Renomeado',
     renameFailed: 'Falha ao renomear',
     renameSession: 'Renomear sessao',

packages/client/src/i18n/locales/zh.ts

@@ -174,6 +174,12 @@ export default {
     monitorRoleUser: '用户',
     monitorRoleAssistant: '助手',
     copySessionId: '复制会话 ID',
+    export: '导出',
+    exportFull: '全量导出 (JSON)',
+    exportCompressed: '压缩导出 (TXT)',
+    exportCompressing: '正在压缩上下文，请稍候...',
+    exportSuccess: '会话已导出',
+    exportFailed: '导出失败',
     renamed: '已重命名',
     renameFailed: '重命名失败',
     renameSession: '重命名会话',