chore(ai): update system prompt for reusing components and using translations

CLAUDE.md

@@ -66,6 +66,15 @@ Frontend uses a widget system (`apps/client/src/widgets/`):
 - `RightPanelWidget` - Widgets displayed in the right panel
 - Type-specific widgets in `type_widgets/` directory
 
+#### Reusable Preact Components
+Common UI components are available in `apps/client/src/widgets/react/` — prefer reusing these over creating custom implementations:
+- `NoItems` - Empty state placeholder with icon and message (use for "no results", "too many items", error states)
+- `ActionButton` - Consistent button styling with icon support
+- `FormTextBox` - Text input with validation and controlled input handling
+- `Slider` - Range slider with label
+- `Checkbox`, `RadioButton` - Form controls
+- `CollapsibleSection` - Expandable content sections
+
 #### API Architecture
 - **Internal API**: REST endpoints in `apps/server/src/routes/api/`
 - **ETAPI**: External API for third-party integrations (`apps/server/src/etapi/`)
@@ -124,6 +133,11 @@ Trilium provides powerful user scripting capabilities:
 - When adding a new locale, follow the step-by-step guide in `docs/Developer Guide/Developer Guide/Concepts/Internationalisation  Translations/Adding a new locale.md`
 - **Server-side translations** (e.g. hidden subtree titles) go in `apps/server/src/assets/translations/en/server.json`, not in the client `translation.json`
 
+#### Client vs Server Translation Usage
+- **Client-side**: `import { t } from "../services/i18n"` with keys in `apps/client/src/translations/en/translation.json`
+- **Server-side**: `import { t } from "i18next"` with keys in `apps/server/src/assets/translations/en/server.json`
+- **Interpolation**: Use `{{variable}}` for normal interpolation; use `{{- variable}}` (with hyphen) for **unescaped** interpolation when the value contains special characters like quotes that shouldn't be HTML-escaped
+
 ### Electron Desktop App
 - Desktop entry point: `apps/desktop/src/main.ts`, window management: `apps/server/src/services/window.ts`
 - IPC communication: use `electron.ipcMain.on(channel, handler)` on server side, `electron.ipcRenderer.send(channel, data)` on client side