⚡ Bolt: [performance improvement] optimize shouldRepaint in MeshRadar

[NITISH-R-G]

💡 What:
Optimized shouldRepaint in _SweepingDotPainter in lib/ui/mesh_radar.dart to check if oldDelegate.orbitRadius != orbitRadius rather than returning true unconditionally.

🎯 Why:
When a CustomPainter delegates animation to the repaint argument of its superclass, returning true unconditionally in shouldRepaint forces a redundant canvas repaint whenever the parent widget rebuilds. The animation state already handles its own repaints via the listenable. This optimization prevents thousands of unnecessary widget rebuilds during the sweep animation.

📊 Impact:
Significantly reduces UI thread workload and memory allocations by avoiding unnecessary Canvas redraws when the parent MeshRadar widget rebuilds (e.g., when the stream of discovered nodes updates).

🔬 Measurement:
Tested via dart analyze and flutter test. Ensure that the sweep animation functions as intended in the MeshRadar without regressions. A journal entry was also added to document this codebase-specific performance pattern.

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PR created automatically by Jules for task 1188008691754179092 started by @NITISH-R-G

Summary by Sourcery

Enhancements:

• Prevent redundant canvas repaints in the MeshRadar sweep painter when only the parent widget rebuilds.

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Reviewer's guide (collapsed on small PRs)

Reviewer's Guide

Optimizes the repaint logic of the MeshRadar sweeping dot custom painter so that it only repaints when its static orbit radius changes, avoiding unnecessary canvas redraws on parent rebuilds.

Sequence diagram for optimized MeshRadar repaint handling

sequenceDiagram
    participant MeshRadar
    participant Painter as _SweepingDotPainter
    participant Animation as repaint Listenable
    participant Canvas

    MeshRadar->>Painter: shouldRepaint(oldDelegate)
    Painter-->>MeshRadar: oldDelegate.orbitRadius != orbitRadius
    alt orbitRadius changed
        MeshRadar->>Canvas: repaint
    else orbitRadius unchanged
        MeshRadar-->>MeshRadar: skip canvas repaint
    end
    Animation->>Painter: notify repaint
    Painter->>Canvas: redraw sweep animation

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File-Level Changes

Change	Details	Files
Optimize _SweepingDotPainter.shouldRepaint to avoid unnecessary repaints driven by parent widget rebuilds.	Replace unconditional true return in shouldRepaint with a comparison between oldDelegate.orbitRadius and orbitRadius. Document the performance rationale in comments, noting that the animation is already driven by the repaint listenable passed to the superclass. Ensure behavior remains correct for sweep animation by tying repaints only to orbitRadius changes rather than parent rebuilds.	lib/ui/mesh_radar.dart

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