feat(guidelines): add general coding, localization, and component naming rules

- Introduced a comprehensive set of general coding guidelines to enhance code readability and maintainability.
- Established a localization rule to prevent hard-coded user-facing text, ensuring all strings are managed through the localization system.
- Defined a naming convention for React components, mandating the use of PascalCase for consistency across the codebase.
- Included examples and enforcement strategies for each rule to facilitate adherence during development and code reviews.

.cursor/rules/localization.md

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+# Localization Rule: No Hard-Coded User-Facing Text
+
+## Rule
+- All user-facing text **must** be added to the localization system at `@/locales`.
+- **Never** hard-code user-facing strings directly in components, pages, or business logic.
+- Use the appropriate i18n or localization utility to fetch and display all text.
+- **Always** provide a `defaultValue` when using the `t()` function for translations, e.g., `{t('emailPlaceholder', {defaultValue: 'Enter your email'})}`.
+
+## Rationale
+- Ensures the application is fully translatable and accessible to all supported languages.
+- Prevents missed strings during translation updates.
+- Promotes consistency and maintainability.
+- Providing a `defaultValue` ensures a fallback is shown if the translation key is missing.
+
+## Examples
+
+### ✅ Correct
+```tsx
+import { useTranslation } from 'react-i18next';
+
+const { t } = useTranslation();
+
+return <input placeholder={t('emailPlaceholder', { defaultValue: 'Enter your email' })} />;
+```
+
+### ❌ Incorrect
+```tsx
+return <input placeholder={t('emailPlaceholder')} />;
+
+// or
+return <input placeholder="Enter your email" />;
+```
+
+## Enforcement
+- All new user-facing text **must** be added to the appropriate file in `@/locales`.
+- Every use of `t()` **must** include a `defaultValue` for fallback.
+- Code reviews should reject any hard-coded user-facing strings or missing `defaultValue` in translations.
+- Refactor existing hard-coded text to use the localization system and add `defaultValue` when modifying related code.