feat: add app icon chooser in settings

[devin-ai-integration]

feat: add app icon chooser in settings

Summary

Re-introduces the app icon chooser that allows users to switch the dock icon between stable, nightly, staging, and pro variants. The feature was previously implemented and then removed. This wires up the existing @hypr/plugin-icon Rust plugin (which already supports setDockIcon/resetDockIcon) to a new UI in the general settings page.

Changes:

• New AppIconSettings component with a 4-column grid of icon previews
• Icon preview PNGs copied from src-tauri/icons/{name}/icon.png into frontend assets
• app_icon field added to the store schema (zod + TinyBase settings mapping)
• Config registry entry with side effect that calls the icon plugin on change
• Wired into the settings form between Transcription and Storage sections

Review & Testing Checklist for Human

• Test on macOS that clicking each icon option actually changes the dock icon — this is macOS-only (#[cfg(target_os = "macos")]) and could not be verified in this environment
• Decide if all 4 icons should be visible to all users — the previous implementation (commit b02ea44d4) had tier-based restrictions (nightly-only for nightly builds, pro gets all icons, free stable gets dark/light). This PR shows all icons to everyone. Adjust if needed.
• No "reset to default" option — once a user selects an icon there is no way to unset it back to undefined. Consider whether a default/reset button is needed.
• Selection styling uses hardcoded border-blue-500 bg-blue-50 — verify this matches the app's design tokens/theme

Notes

• The icon plugin and bundled .icns resources already existed; this PR only adds the frontend UI and settings persistence
• Side effects only fire when the listener is inactive (not during recording), so icon changes won't apply mid-session
• Link to Devin run: https://app.devin.ai/sessions/7119f0de445f42b79d43245e0f47eab9
• Requested by: @ComputelessComputer

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[devin-ai-integration]

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[devin-ai-integration]

✅ Devin Review: No Issues Found

Devin Review analyzed this PR and found no potential bugs to report.

View in Devin Review to see 5 additional findings.