SFTP: File icons by extension

[damarte]

Feature description

All files in the SFTP browser currently use the same generic icon, which makes it slow to scan directories.

Proposal:

• Show distinct icons (SF Symbols / colored) by extension, similar to Finder/VS Code:
  • Code: .py, .js, .ts, .sh, .php, .json, .yaml
  • Docs: .md, .txt, .pdf
  • Web: .html, .css
  • Archives: .zip, .tar, .gz
  • Images: .jpg, .png, .svg, .heic
  • Fallback to generic icon for unknown types.
• Consistent across iOS / iPadOS / macOS, respects light/dark mode.

Screenshots / Draws

Current: all rows show same doc icon.
Proposed: row shows 📄 vs 🐍 vs 🖼️ vs 📦 per extension + optional extension color dot.