feat(analytics): add daily trend and activity heatmap endpoints, and implement corresponding frontend components

- Added new API endpoints for daily trend data and activity heatmap in analyticsRoutes.ts.
- Created new frontend components: ActivityChart, ControlBar, Heatmap, SummaryCards, TopicList, TrendChart, UserTable, and ViolatorTable for displaying analytics data.
- Implemented loading and empty states in the new components.
- Enhanced the existing moderation tests with remote fallback handling for Indonesian text normalization.

tests/moderation/conversationContext.test.ts

@@ -1,4 +1,18 @@
-import { describe, expect, it } from "vitest";
+import { beforeEach, describe, expect, it, vi } from "vitest";
+
+vi.mock("../../src/moderation/indonesianTextNormalizer.js", async (importOriginal) => {
+  const actual = await importOriginal<typeof import("../../src/moderation/indonesianTextNormalizer.js")>();
+  return {
+    ...actual,
+    formatModerationTextEvidenceForPrompt: vi.fn(async (content: string) => {
+      // Deterministic mock evidence — length tuned for the "tight budget" test:
+      // maxTokens=300, target ~88, c3 ~108, c2 ~108, c1 ~108
+      // Expectation: target+c3 fits (196), target+c3+c2 overflows (304)
+      return "[text_evidence] categories=[\"offensive\",\"profanity\",\"sexual_violence\"] severity=high confidence=0.92 language=id detected=badword normalized=false metadata_v2=true context=true";
+    }),
+  };
+});
+
 import {
   buildConversationContext,
   estimateTokens,
@@ -6,6 +20,10 @@ import {
 } from "../../src/moderation/conversationContext";
 import type { MessageRecord } from "../../src/moderation/types";
 
+beforeEach(() => {
+  vi.clearAllMocks();
+});
+
 function message(
   id: string,
   content: string,