fix: keep handoff provider logos visible in dark themes

[dillonzq]

Provider logos such as Pi, Cursor and Claude Code render as black artwork against the Handoff panel's dark background. The shared ProviderMark now gives logo images a white backing tile, and both route chips stop overriding that background with transparency. This keeps the original logo colors and the existing initials fallback, covering both the source/target route and the provider picker.

SVG files loaded through img cannot inherit the surrounding application's currentColor. A backing tile addresses that limitation without adding provider-specific assets or inverting colored logos.

Validation: npm run typecheck; npm test (123 tests passed); bb plugin build .

Fixes #1

[Copilot]

🟢 Approval recommended

The change is localized, aligns with the stated issue/PR description, and removes the specific styling overrides that caused poor dark-theme contrast.

Pull request overview

This PR fixes provider logos becoming illegible in dark themes within the Handoff UI by ensuring image-based provider marks always render on a white backing tile and by removing route-chip styling that previously forced the mark background to transparent.

Changes:

• Updated ProviderMark to use a fixed bg-white backing tile for <img>-based provider logos.
• Updated both source and target route chips to stop overriding the mark background with bg-transparent, preserving the new backing tile.

File summaries

File	Description
app.tsx	Makes provider logo rendering theme-resilient via a white backing tile and prevents route chips from overriding it.

Review details

• Files reviewed: 1/1 changed files
• Comments generated: 0
• Review effort level: Lite

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