perf(home): stop popular threads rerenders after load

docs/agent-runs/popular-threads-rerenders/feature-list.json

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+{
+  "task": "popular-threads-rerenders",
+  "last_updated": "2026-04-19",
+  "items": [
+    {
+      "id": "F001",
+      "priority": 1,
+      "status": "completed",
+      "description": "Reduce unnecessary rerenders in the popular threads box after the popular-thread algorithm finishes and the loaded list is stable until hard refresh.",
+      "verification": [
+        "./scripts/agent-init.sh --smoke",
+        "profile popular threads rerender behavior with react-scan",
+        "yarn build",
+        "yarn lint",
+        "yarn type-check",
+        "yarn doctor",
+        "playwright-cli browser checks across Blink, Gecko, and WebKit"
+      ],
+      "files": [
+        "src/hooks/use-current-time.ts",
+        "src/hooks/use-popular-posts.ts",
+        "src/hooks/__tests__/browser-hooks.test.tsx",
+        "src/views/home/popular-threads-box/popular-threads-box.tsx",
+        "src/views/home/popular-threads-box/__tests__/popular-threads-box.test.tsx"
+      ],
+      "notes": "Post-fix profile measured 0 React commits and no PopularThreadsBox/PopularThreadCard/CatalogPostMedia/ContentPreview rerenders in the 10s window after Popular Threads became visible."
+    }
+  ]
+}

docs/agent-runs/popular-threads-rerenders/progress.md

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+# Progress Log
+
+Append one entry per session.
+
+## 2026-04-19 00:00
+
+- Item: F001
+- Summary: Created a fresh worktree and initialized task tracking before profiling the popular threads rerender issue.
+- Files: `docs/agent-runs/popular-threads-rerenders/feature-list.json`, `docs/agent-runs/popular-threads-rerenders/progress.md`
+- Verification: pending
+- Blockers: none
+- Next: Run baseline smoke check, profile the affected views, identify the popular threads source components, then implement the scoped rerender fix.
+
+## 2026-04-19 14:56
+
+- Item: F001
+- Summary: Detached Popular Threads from feed-state and community subscriptions after the popular-post cache is revealed, and disabled timer updates for frozen current-time consumers.
+- Files: `src/hooks/use-current-time.ts`, `src/hooks/use-popular-posts.ts`, `src/hooks/__tests__/browser-hooks.test.tsx`, `src/views/home/popular-threads-box/popular-threads-box.tsx`, `src/views/home/popular-threads-box/__tests__/popular-threads-box.test.tsx`
+- Verification: `./scripts/agent-init.sh --smoke` with branch-scoped `AGENT_APP_URL`, `yarn test`, targeted Vitest files, `yarn build`, `yarn lint`, `yarn type-check`, `yarn doctor`, `yarn knip`, pre/post profile-browsing runs, `playwright-cli` desktop and mobile checks in Chrome, Firefox, and WebKit
+- Blockers: none
+- Next: Review and commit the completed task branch.