⚡ Bolt: [performance improvement] Optimize MeshRadar CustomPainter repaints

[NITISH-R-G]

💡 What: Modified shouldRepaint in _SweepingDotPainter to only return true when orbitRadius changes.
🎯 Why: Unconditionally returning true forces unnecessary canvas repaints when the parent widget rebuilds, even though the animation state already handles its own repaints via the repaint parameter in super().
📊 Impact: Prevents redundant repaints during parent widget builds, improving performance and reducing unnecessary load.
🔬 Measurement: Verify by running the application and checking Flutter performance overlay or DevTools timeline during mesh radar view.

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PR created automatically by Jules for task 15559680427310015553 started by @NITISH-R-G

Summary by Sourcery

Enhancements:

• Restrict _SweepingDotPainter repaints to orbitRadius changes to reduce redundant canvas redraws and improve performance.

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Reviewer's guide (collapsed on small PRs)

Reviewer's Guide

Refines the MeshRadar CustomPainter repaint behavior so that repaints only occur when the non-animated orbit radius changes, avoiding unnecessary canvas work on parent rebuilds.

Flow diagram for updated CustomPainter repaint logic

flowchart TD
  parent_build[Parent widget rebuild]
  painter[_SweepingDotPainter]
  orbit_changed{orbitRadius changed?}
  repaint_canvas[Repaint canvas]
  skip_repaint[Skip repaint]
  animation_tick[Animation tick via repaint parameter]

  parent_build --> painter
  painter --> orbit_changed
  orbit_changed -->|yes| repaint_canvas
  orbit_changed -->|no| skip_repaint

  animation_tick --> repaint_canvas

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File-Level Changes

Change	Details	Files
Make _SweepingDotPainter.shouldRepaint depend only on orbitRadius instead of always repainting.	Replace unconditional true return in shouldRepaint with logic comparing oldDelegate.orbitRadius to orbitRadius. Document in-code that animation-driven repaints are already handled via the repaint parameter passed to the CustomPainter super constructor. Clarify that parent widget rebuilds should not by themselves trigger canvas repaints unless non-animation properties change.	lib/ui/mesh_radar.dart

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