feat(i18n,admin): modular localization dictionary & admin console demo preview

.cline-context.md

@@ -4,14 +4,14 @@
 
 - **Core Architecture & Source Structure:**
   - `src/app/`: Next.js App Router root layouts, providers, auth/demo/admin views, and REST/CalDAV API endpoints (`/api/tasks`, `/api/lists`, `/api/import`, `/api/dav/[...path]`).
-  - `src/components/layout/`: `AppShell.tsx` (3-panel main layout, resizer coordination, mobile drawer overlay), `Sidebar.tsx` (draggable resizer, lists tree, tag & trash navigation, profile & import popover).
+  - `src/components/layout/`: `AppShell.tsx` (3-panel main layout, resizer coordination, mobile drawer overlay), `Sidebar.tsx` (draggable resizer, lists tree, tag & trash navigation, profile, import & export popover, admin console link).
   - `src/components/tasks/`:
-    - `TaskList.tsx`: Recursive n-depth hierarchical checklist, inline title editing, context menu, smart quick-add toolbar.
+    - `TaskList.tsx`: Recursive n-depth hierarchical checklist, Notion-style 6-dot drag handle (`⋮⋮`) with DND reordering, inline title editing (`F2`/double-click), right-aligned hover subtask trigger, 6-second interactive Undo toast banner.
     - `TaskDetail.tsx`: Right-side detail panel, modular block swap (Subtasks ⇄ Markdown Note), mouse drag split resizer, mobile bottom-sheet with swipe-down dismissal.
     - `MarkdownNoteEditor.tsx`: Distraction-free text/markdown note canvas with DOMPurify sanitization & preview rendering.
     - `KanbanView.tsx`: CheckFlow Labs 3-column Kanban board view (`To Do` / `In Progress` / `Done`).
-  - `src/components/settings/`: `SettingsModal.tsx` (Profile, Preferences, Labs, Integrations/DAVx⁵, Admin tabs).
-  - `src/lib/`: `userPrefs.ts` (global user customization state store), `useUserPrefs.ts` (reactive preferences hook & CSS variable injector), `i18n/` (EN/KO/JA localization dictionary), `mockData.ts` (LocalStorage demo store), `auth.ts`, `prisma.ts`.
+  - `src/components/settings/`: `SettingsModal.tsx` (Profile, Preferences, Labs, Integrations/CalDAV, Admin tabs).
+  - `src/lib/`: `userPrefs.ts` (global user customization state store), `useUserPrefs.ts` (reactive preferences hook & CSS variable injector), `i18n/` (modular EN/KO/JA localization dictionaries: `types.ts`, `locales/en.ts`, `locales/ko.ts`, `locales/ja.ts`), `mockData.ts` (LocalStorage demo store), `auth.ts`, `prisma.ts`.
   - `src/middleware.ts`: Route-level auth and admin role verification guard.
 
 - **Completed So Far:**
@@ -20,20 +20,16 @@
   - Verified 100% implementation of core features: n-depth recursive checklist, real-time subtask synchronization, modular blocks & split resizer, 3-way theme (VSCode dark / pastel light / system), global `UserPrefs` customization, Labs Kanban view, and mobile bottom sheet.
   - Enhanced CalDAV / DAVx⁵ synchronization endpoint (`src/app/api/dav/[...path]/route.ts`) with full RFC 4791 support: `OPTIONS`, `PROPFIND` (principal & calendar collection discovery), `REPORT` (calendar-query/multiget), `PUT` (task upsert from VTODO), and `DELETE`.
   - Upgraded Settings Modal "Integrations (CalDAV)" tab with multi-platform interactive guides (Android/DAVx⁵, Apple Reminders, Thunderbird), one-click URL copy feedback, ICS feed direct download, and live endpoint test ping.
-  - Standardized all synchronization terminology from brand-specific references to open standards and Android/Apple cross-platform guidelines.
   - Implemented full-fidelity standard Task Export pair (`/api/export`) supporting RFC 4180 / TickTick-compatible CSV with UTF-8 BOM, and RFC 5545 iCalendar (`.ics` VTODO) format.
   - Added Export modal in Sidebar user popover menu supporting format selection, target list filtering, completed tasks inclusion toggle, and seamless Demo mode client-side Blob generation.
-  - Refined Korean and Japanese localization dictionaries across all keys for natural, polished phrasing and terminology consistency.
+  - Refactored `i18n` into a clean modular dictionary architecture (`src/lib/i18n/types.ts`, `locales/en.ts`, `locales/ko.ts`, `locales/ja.ts`) with 100% dictionary completeness and natural phrasing across English, Korean, and Japanese.
+  - Enhanced Admin console (`src/app/admin/page.tsx`), Settings Modal Admin tab, and Middleware to seamlessly support both authenticated ADMIN users and Demo mode admin preview.
+  - Added Admin Console direct entry in Sidebar user popover menu for swift navigation.
   - Fixed Docker container runtime Prisma migration dependencies by adding `effect` and ensuring full `node_modules` availability in the production runner stage of `Dockerfile` for seamless entrypoint `prisma migrate deploy`.
   - Refined `docker-compose.yml` and `.env.example` to support standalone 2-file deployment (`docker-compose.yml` + `.env`) without cloning source code, public registry images (`CHECKFLOW_IMAGE`), Watchtower auto-updating labels, and automated database migrations.
   - Automated Gitea Actions CI workflow (`.gitea/workflows/docker-build.yaml`) for building & pushing container images to Gitea Container Registry with lowercase repository name normalization (`env.REPO`) and OCI source labels (`org.opencontainers.image.source`) for automatic repository package linkage.
   - Completely revamped `README.md` to reflect universal 2-file Docker deployment for general users, Watchtower auto-update, architecture, and open-standard CalDAV sync guidelines.
-  - **Enhanced Task Row UX & Interactive Undo Toast (v0.6.3)**:
-    - Added Notion-style 6-dot drag handle on each task row with drag-and-drop task reordering.
-    - Added `F2` shortcut key and double-click to trigger inline title editing.
-    - Moved "+ Subtask" button to the right-aligned hover area and removed redundant explicit edit pencil button.
-    - Implemented floating interactive Undo Toast banner with 6-second grace period for soft delete and instant undo.
-    - Fixed Trash and task tree duplicate rendering in LocalStorage demo store.
+  - Enhanced Task Row UX & Interactive Undo Toast (v0.6.3): Notion-style 6-dot drag handle (`⋮⋮`), DND reordering, `F2` inline editing, right-aligned subtask button, and 6-second floating Undo toast banner.
   - Validated that `npm run lint` and `npm run build` execute with 0 errors and 0 warnings.
 
 - **Next Steps (Todo):**
@@ -46,5 +42,5 @@
   - **Sanitization**: Never render raw HTML without DOMPurify; always sanitize CSV/ICS user inputs against formula injection (`sanitizeFormula`).
   - **Admin Gatekeeping**: Admin routes must strictly require `role === "ADMIN"` both on server/middleware and client.
   - **User Customization Priority**: Any new UI preferences (sizes, positions, order) must be persisted through `userPrefs.ts` and respect the "Reset to Defaults" Labs option.
-  - **i18n Consistency**: Any newly added UI string must be translated across all 3 language dictionaries (`en`, `ko`, `ja`) in `src/lib/i18n/translations.ts` and `src/lib/i18n/index.tsx`.
+  - **i18n Consistency**: Any newly added UI string must be translated across all 3 language dictionaries (`en`, `ko`, `ja`) in `src/lib/i18n/locales/`.
   - **Mobile Bottom-Sheet Convention**: Maintain touch gestures (`mobile-open` class, Y-axis swipe threshold > 120px) for the detail panel on mobile screens.