React hook exhaustive-deps lint warnings in canvas components

[rishibaghel25]

Describe the bug
npm run build / next build surfaces several pre-existing react-hooks/exhaustive-deps warnings (build still succeeds, these don't block anything, just noise on every build):

./components/agent/AgentOverview.tsx
73:9  Warning: The 'hostMeta' logical expression could make the dependencies of useMemo Hook (at line 82) change on every render.

./components/canvas/InfraCanvas.tsx
417:6  Warning: React Hook useEffect has missing dependencies: 'setEdges', 'setNodes', and 'spotlightKey'.
422:6  Warning: React Hook useEffect has a missing dependency: 'setNodes'.

./components/canvas/LogsPanel.tsx
94:6  Warning: React Hook useEffect has a missing dependency: 'targetNode'.

Also a no-img-element warning in components/Logo.tsx (two <img> tags suggested to become next/image, likely intentionally skipped there for the logo, worth a look either way).

Expected behavior
A clean npm run build with no lint warnings, or an explicit // eslint-disable-next-line with a comment explaining why, for any that are genuinely intentional (e.g. hostMeta and targetNode are probably safe to include in the deps array; setEdges/setNodes from a state-setter source might be legitimately stable and worth an inline suppress instead of adding them).

Additional context
Good first issue: small, scoped, one file at a time, verify with cd frontend && npm run build after each.