feat(client): add Timestamp component, ESLint 10 + Prettier, and code quality fixes

- add Timestamp component with moment relative time and ISO tooltip
- add Timestamp stories (JustNow, MinutesAgo, HoursAgo, DaysAgo, MonthsAgo)
- add ESLint 10 with typescript-eslint, react-hooks, react-refresh, prettier
- add Prettier config with singleQuote, semi, trailingComma all, printWidth 100
- add lint, lint:fix, format, test:storybook scripts to package.json
- fix react-hooks/set-state-in-effect in all page components
- auto-fix 113 Prettier formatting issues across src and .storybook

client/package.json

@@ -8,17 +8,23 @@
     "build": "tsc -b && vite build",
     "preview": "vite preview",
     "storybook": "storybook dev -p 6006",
-    "build-storybook": "storybook build"
+    "build-storybook": "storybook build",
+    "test:storybook": "vitest run --project storybook",
+    "lint": "eslint src .storybook",
+    "lint:fix": "eslint src .storybook --fix",
+    "format": "prettier --write \"src/**/*.{ts,tsx}\" \".storybook/**/*.{ts,tsx}\""
   },
   "dependencies": {
     "i18next": "^26.0.4",
     "lucide-react": "^1.7.0",
+    "moment": "^2.30.1",
     "react": "^19.1.0",
     "react-dom": "^19.1.0",
     "react-i18next": "^17.0.2",
     "react-router-dom": "^7.14.0"
   },
   "devDependencies": {
+    "@eslint/js": "^9.39.4",
     "@storybook/addon-a11y": "^10.3.5",
     "@storybook/addon-docs": "^10.3.5",
     "@storybook/addon-vitest": "^10.3.5",
@@ -28,9 +34,16 @@
     "@vitejs/plugin-react": "^4.4.1",
     "@vitest/browser-playwright": "^4.1.3",
     "@vitest/coverage-v8": "^4.1.3",
+    "eslint": "^10.2.0",
+    "eslint-config-prettier": "^10.1.8",
+    "eslint-plugin-prettier": "^5.5.5",
+    "eslint-plugin-react-hooks": "^7.0.1",
+    "eslint-plugin-react-refresh": "^0.5.2",
     "playwright": "^1.59.1",
+    "prettier": "^3.8.1",
     "storybook": "^10.3.5",
     "typescript": "~5.8.3",
+    "typescript-eslint": "^8.58.1",
     "vite": "^6.3.1",
     "vitest": "^4.1.3"
   }