Make executable bits additive with symlink/submodule priority in file icons

[Copilot]

Previously, executable files showed a separate "Ex" badge alongside the file icon, which didn't integrate well with the visual design. This change makes executable indicators additive by overlaying a small "x" badge on the base file icon, while ensuring symlinks and submodules always display their specific icons regardless of executable status.

Changes

File Icon System Overhaul:

• Added new fileType prop to FileIcon, FileName, FileListItem, and FileViewHeader components
• Created fileTypeUtils.ts with functions to determine file types from TreeChange objects
• Added new SVG icons for symlinks, submodules, and executable overlay
• Removed the separate ExecutableLabel component in favor of integrated overlay

Icon Behavior:

• Regular files: Show base icon without overlay
• Executable files: Show base icon with small green "x" overlay in top-right corner
• Symlinks: Always show cyan chain/link icon, never executable overlay
• Submodules: Always show orange folder-with-git-badge icon, never executable overlay

Backend Integration:

• Updated FileList and FileListItemWrapper to detect file types from ChangeState.kind
• Maintains backward compatibility with existing executable prop
• Properly handles all git object types: Blob, BlobExecutable, Link, Commit

Visual Result

The new system provides a cleaner, more integrated approach where:

• Executable status is visually additive rather than separate
• Symlinks and submodules maintain their distinct visual identity
• File type hierarchy is respected (symlink/submodule > executable > regular)

This addresses the issue where executable files should have their base icon with an executable indicator, while ensuring symlinks and submodules always look like what they are regardless of their executable status.

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1 Skipped Deployment

Project	Deployment	Preview	Comments	Updated (UTC)
gitbutler-web	Ignored	Preview		Sep 11, 2025 10:14am

[Byron]

This already kind-of works, even though I think the code needs a lot of cleanup and that it's easier to just do it by hand. Would this be a quick-thing for @estib-vega ?
If so, the PR could be finalised by @PavelLaptev so we get proper icons and merge this 🎉.