Run browser tests on the GPU on Linux

[roprgm]

Change

On Linux, Playwright's Chromium now uses the machine's GPU through ANGLE on Vulkan instead of SwiftShader, so the browser suite runs in about a minute instead of 5+ and no longer times out under parallel workers. macOS is unchanged; Windows keeps SwiftShader. The editing test had a race: it read the mask's curve histogram before the exposure change reached it. It now waits for the histogram to change, and it gets the 90 s timeout the other long workflows already use.

Verification

• Linux (Intel Arc, Mesa Vulkan): bun run test:browser three times in a row: 81 passed, 1 skipped (HEIC: Playwright's Chromium has no HEVC decoder on Linux), ~1 min each. Before: 5.3 min with 2 workers on SwiftShader; with default workers, many timeouts.
• bun run test (68 pass), bun run check, bun run build.
• macOS flags are unchanged; not re-run on a Mac.
• Linux now needs a GPU with a Vulkan driver for browser tests; CI does not run them.

🤖 Generated with Claude Code

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Summary by CodeRabbit

• Tests
  • Expanded coverage of mask exposure adjustments to verify that histogram values respond to changes.
  • Increased the time allowed for editing workflow checks to complete.
  • Updated browser test settings for platform-specific graphics rendering.

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• playwright.config.ts
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