Custom icon setting for apps and collections (emoji, character, or PNG)

[davidtaylor6130]

Summary

Let the user set a custom icon for apps and collections so sidebar entries are easier to organize and visually distinct.

Requested behavior

• A setting for each app and each collection (resource collection) to assign a custom icon:
  • set from the app/collection settings, or a context menu on the sidebar entry
• Supported icon types:
  • an emoji
  • a single character
  • a small PNG (simple image pick)
• Icon renders in the sidebar next to the app/collection name, replacing the default icon
• Falls back to the current default icon when no custom icon is set
• Persists with the app/collection metadata across app restarts (saved via the native layer like other collection metadata)

Motivation

With several apps and collections in the sidebar, name-only scanning is slow. A distinct icon per app/collection makes groups easier to spot at a glance.

Notes

• Deliberately kept minimal: one icon per entry, three supported formats (emoji / character / small PNG). No full image library, drag-to-reorder, or theming.