ios: match launch screen logo to the App Store icon glyph

[azooz2003-bit]

The launch screen chevron (from #10621) drifted from the shipped app icon: it was re-rendered from the website palette and cmux-icon.svg geometry, giving a duller gradient (#5cc6f9→#5676ed vs the icon's #05cffe→#536ef3), thicker arms, a deeper notch, and no glow. Aziz flagged that the launch screen should show the icon as it appears in App Store Connect.

This regenerates LaunchLogo.imageset (1x/2x/3x) directly from the Icon Composer source glyph AppIcon.icon/Assets/cmux-icon-chevron 2.png, which composites onto white to reproduce AppIcon.png within anti-aliasing error (mean channel diff 0.28/255). The crop is symmetric around the chevron core so the glyph stays centered, scaled to keep the core at 48pt like the current launch screen. The baked glow renders correctly on both the white and black LaunchBackground, matching AppIconDark.png's glow-on-dark treatment.

Asset-only change; Info.plist and Contents.json are untouched.

Dictionary:

• Icon Composer source glyph: the transparent PNG layer inside AppIcon.icon that Apple's Icon Composer composites into the final app icon.
• SplashBoard cache: iOS caches a rendered launch-screen snapshot; asset-only changes can show stale until the cache regenerates.

🤖 Generated with Claude Code

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Summary by cubic

Regenerates the iOS launch screen logo from the App Store icon source so the launch screen matches the shipped app icon.

The old logo was re-rendered from the website palette and cmux-icon.svg, producing a duller gradient, thicker chevron arms, a deeper notch, and no glow. The new 1x/2x/3x assets are composited directly from the Icon Composer glyph, which reproduces AppIcon.png within anti-aliasing error.

• Asset-only change; Info.plist and Contents.json are untouched.
• iOS caches the launch-screen snapshot, so the new logo may not appear until the cache regenerates.

^{Written for commit aafd2e1. Summary will update on new commits.}

[coderabbitai]

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• ios/cmux/Assets.xcassets/LaunchLogo.imageset/LaunchLogo.png is excluded by !**/*.png
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• ios/cmux/Assets.xcassets/LaunchLogo.imageset/LaunchLogo@3x.png is excluded by !**/*.png

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