feat(icon): Phosphor glyph card — hero + real-UI-size strip (T-313)

The icon card renders each glyph at a hero size plus a continuous sample
strip (10–48px) so legibility is judged at the sizes the app uses, with the
entry's optional label + description and a per-entry or card-level color.
Wired end to end: icon.show publishes on the `icon` bus, the Claude
extension injects an IconMessage, and conversation_view paints the card
(display-only, D-78). en+nl catalogs.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

CHANGELOG.md

@@ -18,6 +18,10 @@ heading, and (b) bumping `pubspec.yaml` `version:` in the same commit.
 
 ### Added
 
+- **Phosphor glyph cards.** `clide icon show gear folder` (or `--file` entries
+  with label/description/color) renders glyphs in the conversation at a hero
+  size plus a real-UI-size strip (10–48), for previewing and comparing icons.
+  Resolves by name or 0xNNNN codepoint; honest error on an unknown glyph. (T-313)
 - **Annotated image cards.** `clide image show --file meta.json` attaches a
   title/label and a longer description to an image card (alongside the existing
   one-line caption); the bare `image show <path> --caption` form is unchanged.