feat(desktop): choose external project icons

[Bil0000]

What changed

Project icon picker now has Open in Finder, Open in Explorer, or Open in Files. This opens the native image picker, so the image can live outside the project.

• Keeps existing project-file search unchanged.
• Limits native picker to local desktop projects. Remote, mixed-environment, and WSL-only project groups keep project search only.
• Serves selected external image through a signed URL tied to that exact file.

Why

Previously, users had to copy an image into the project before they could use it as the project icon. This adds the native picker without widening general workspace file access.

Before and after

Before

After

Verification

• Code and test CI checks pass.
• Macroscope correctness, Effect conventions, and UI consistency checks pass.
• Focused web, desktop, and server tests pass.
• Contracts, desktop, web, and server type checks pass.

Checklist

• This PR is small and focused
• I explained what changed and why
• I included before and after screenshots
• No animation was added, so a video is not applicable

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Note

Add native external project favicon picker to desktop app

• Adds a new IPC endpoint pickProjectFavicon (window.ts) that opens a single-file native image picker and returns the selected path
• Extends AssetAccess (AssetAccess.ts) to issue and resolve asset URLs for favicons stored outside the workspace, using a new project-favicon-external claim kind with exact-path matching
• Updates ProjectFaviconResolver (ProjectFaviconResolver.ts) to accept absolute filesystem paths as favicon candidates via a filesystem scope
• Adds a native picker footer action to ProjectFaviconPickerDialog (ProjectFaviconPickerDialog.tsx), gated by platform and path consistency via canPickExternalProjectFavicon
• Behavioral Change: ElectronDialogPickFilesInput now requires an explicit multiple flag; existing pickFiles callers (e.g. pickThemeFiles) must pass it explicitly

^{Macroscope summarized 3b4b4bc.}

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[macroscopeapp]

Reviewed the web UI changes (ProjectFaviconPickerDialog.tsx, ProjectSettingsPanel.tsx). Two consistency findings: the palette footer "Open in " action is now duplicated verbatim (button treatment and label logic) instead of being shared with the command palette. Details inline.

^{Posted via Macroscope — UI Consistency}

[macroscopeapp]

Approvability

Verdict: Not approved

Macroscope's review found this PR not approvable — This PR adds a new feature allowing users to pick project icons from external filesystem locations, introducing new IPC channels, asset claim types, and UI components. New features with cross-cutting behavior changes warrant human review.

^{You can add or adjust custom eligibility rules. Learn more.}