feat: improve badges display with images and limited count (#128)

- Add badge image display to BadgeDefinitionRenderer feed items
  - Shows badge image/icon (16x16) with name and description
  - Falls back to Award icon if no image available
- Limit ProfileBadgesRenderer to show max 5 badges with "& n more" pattern
  - Prevents overcrowded feeds when users have many badges
  - Maintains clickability to see full list in detail view
- Rename "Badge definition" to "Badge" for clearer user-facing text
  - Updated constants/kinds.ts and nostr-kinds-schema.yaml
  - Simplifies terminology (kind 30009 is just "Badge" not "Badge definition")

Co-authored-by: Claude <noreply@anthropic.com>

src/data/nostr-kinds-schema.yaml

@@ -1402,7 +1402,7 @@ kinds:
       - *etag
 
   30009:
-    description: Badge Definition
+    description: Badge
     in_use: true
     content:
       type: free