fix(fancy-audiovisualizer): prevent content clipping at widget border

[odtgit]

Summary

• Visualization content (bars, waves, bloom glow) was being hard-clipped at the widget's rounded corners, especially at high sensitivity and bloom intensity settings
• Added dynamic UV scaling that computes the maximum possible content extent from the current sensitivity and bloomIntensity settings, shrinking the visualization to always fit within the widget
• Added a smooth radial edge fade that catches bloom tails in the remaining space between content and border

How it works

The content scale is calculated per-frame from uniforms:

maxContentRadius = 0.35 + sensitivity * 0.5    // max bar/wave extent
maxBloomReach    = bloomIntensity * 1.0         // exp decay to <1/255
contentScale     = (maxContent + bloom) * 1.05  // 5% safety margin

The edge fade uses smoothstep from maxContentRadius/contentScale to 1.0 in widget space, so it only attenuates bloom glow and never affects the main visualization geometry.

At default settings (sensitivity=1.5, bloom=0.5) contentScale ≈ 1.68. At max settings (sensitivity=3.0, bloom=1.0) contentScale ≈ 2.99. It auto-adapts to whatever the user configures.

Test plan

• Toggle widget on/off and verify it loads correctly
• Set sensitivity to max (3.0) and bloom to max (1.0) — no clipping at borders
• Set sensitivity to min (0.5) and bloom to 0 — visualization fills most of the widget
• Test all visualization modes (bars, wave, rings, combined, all)
• Verify bloom glow fades smoothly near edges rather than cutting off

[github-actions]

@ItsLemmy - this PR modifies your plugin. Please review when you have a chance.

[github-actions]

@ItsLemmy - this PR modifies your plugin. Please review when you have a chance.

[ItsLemmy]

Thanks!

[odtgit]

Glad to help, was getting annoyed by the bloom clipping creating a moving border around my otherwise transparent visualization, looks flawless now :)