feat: time range selector & area chart improvements

- Add 7D/30D/3M toggle on Daily Activity and Comparison Between Villages charts
- Switch LineChart to AreaChart with fillOpacity 0.4 for bold gradient fill
- Fix broken tooltip on all charts with custom dark card content
- Apply consistent chart style (tickLine, gridAxis, glow) to village detail page
- api.ts: getDailyActivity and getComparisonActivity now accept range param

src/frontend/config/api.ts

@@ -27,8 +27,8 @@ export const API_URLS = {
     return `${DESA_PLUS_PROXY}/api/monitoring/log-all-villages?${params}`
   },
   getGridOverview: () => `${DESA_PLUS_PROXY}/api/monitoring/grid-overview`,
-  getDailyActivity: () => `${DESA_PLUS_PROXY}/api/monitoring/daily-activity`,
-  getComparisonActivity: () => `${DESA_PLUS_PROXY}/api/monitoring/comparison-activity`,
+  getDailyActivity: (range: 7 | 30 | 90 = 7) => `${DESA_PLUS_PROXY}/api/monitoring/daily-activity?range=${range}`,
+  getComparisonActivity: (range: 7 | 30 | 90 = 7) => `${DESA_PLUS_PROXY}/api/monitoring/comparison-activity?range=${range}`,
   postVersionUpdate: () => `${DESA_PLUS_PROXY}/api/monitoring/version-update`,
   createVillages: () => `${DESA_PLUS_PROXY}/api/monitoring/create-villages`,
   createUser: () => `${DESA_PLUS_PROXY}/api/monitoring/create-user`,