perf: debounce dashboard render on websocket events

Co-authored-by: PR0M3TH3AN <[email protected]>

src/context/CONTEXT_2026-02-24T01-10-54Z.md

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+---
+agent: perf-agent
+cadence: daily
+run-start: 2026-02-24T01:10:54Z
+---
+
+# Context
+
+Executed prompt: src/prompts/daily/perf-agent.md
+
+## Goal
+Daily, measurable improvement of app responsiveness by finding and fixing background CPU/network work that degrades UX.
+
+## Scope
+- `src/` directory for performance patterns.
+- `dashboard/` for UI responsiveness.
+
+## Constraints
+- Never invent files or APIs.
+- Keep changes small and incremental.
+- Verify changes with tests.