fix(tabs): render local favicons in color

[zorahrel]

Problem

LocalFavIcon applies .grayscale(1.0) to every favicon loaded from disk:

Image(nsImage: image)
    .frame(width: 16, height: 16)
    .cornerRadius(4)
    .grayscale(1.0)   // <-

The AsyncImage path used for remote favicons has no such modifier, so the same site renders in color when fetched from the network and desaturated when restored from the local cache. Since cached icons are what you see on launch and for pinned/favorite tabs, the sidebar ends up mostly gray.

Change

Removes the modifier so both code paths render consistently.

Testing

Built Release on macOS 26.2 and verified favicons in the sidebar keep their colors both on first load and after restart.

[greptile-apps]

Confidence Score: 5/5

The PR appears safe to merge with no actionable correctness, security, or repository-rule issues identified.

Summary

This PR makes locally cached favicons render consistently with remotely loaded favicons.

• Removes forced grayscale rendering from LocalFavIcon.
• Preserves existing sizing, scaling, corner radius, and fallback-symbol styling.

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