[QA] Re-enable React strict hooks rules incrementally

[juacker]

Context

PR #3 introduced ESLint with React hooks rules disabled because the existing codebase predates React 19 strict hooks linting.

Disabled rules

The following rules are currently set to 'off' in eslint.config.js:

• react-hooks/set-state-in-effect — ~28 violations
• react-hooks/exhaustive-deps — ~29 violations
• react-hooks/preserve-manual-memoization — ~15 violations
• react-hooks/refs — ~6 violations
• react-hooks/immutability — ~10 violations
• react-hooks/use-memo — ~5 violations
• react-hooks/purity — ~3 violations

Recommended approach

Enable one rule at a time as a warning (not error), fix the violations in focused PRs, then promote to error once clean.

Files with the most violations

• src/components/ChartsView/ContextChart.jsx
• src/components/Dashboard/Dashboard.jsx
• src/hooks/useCommandRegistration.js
• src/agents/useAgentBridge.js
• src/pages/Workspace.jsx