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specs/013-unify-frontend-css/data-model.md

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+# Data Model: Frontend State & Components
+
+## 1. i18n State (Client-Side)
+
+The application state for internationalization is transient (in-memory) but initialized from and persisted to `localStorage`.
+
+### Entities
+
+#### `Locale`
+- **Type**: String Enum
+- **Values**: `"ru"`, `"en"`
+- **Default**: `"ru"`
+- **Persistence**: `localStorage.getItem("locale")`
+
+#### `TranslationDictionary`
+- **Type**: JSON Object
+- **Structure**: Nested key-value pairs where values are strings.
+- **Example**:
+  ```json
+  {
+    "common": {
+      "save": "Сохранить",
+      "cancel": "Отмена"
+    },
+    "dashboard": {
+      "title": "Панель управления"
+    }
+  }
+  ```
+
+## 2. Component Props (Contracts)
+
+These define the "API" for the standardized UI components.
+
+### `Button`
+- **variant**: `"primary" | "secondary" | "danger" | "ghost"` (default: "primary")
+- **size**: `"sm" | "md" | "lg"` (default: "md")
+- **isLoading**: `boolean` (default: false)
+- **disabled**: `boolean` (default: false)
+- **type**: `"button" | "submit" | "reset"` (default: "button")
+- **onClick**: `() => void` (optional)
+
+### `Input`
+- **label**: `string` (optional)
+- **value**: `string` (two-way binding)
+- **placeholder**: `string` (optional)
+- **error**: `string` (optional)
+- **disabled**: `boolean` (default: false)
+- **type**: `"text" | "password" | "email" | "number"` (default: "text")
+
+### `Card`
+- **title**: `string` (optional)
+- **padding**: `"none" | "sm" | "md" | "lg"` (default: "md")
+
+### `Select`
+- **options**: `Array<{ value: string | number, label: string }>`
+- **value**: `string | number` (two-way binding)
+- **label**: `string` (optional)
+- **disabled**: `boolean` (default: false)