feat(studio): improve context compression UI and provider display

- Add visual indicator when messages are collapsed (folder icon)
- Add animation to token bar during compression (pulse effect)
- Token bar becomes more compact after compression with "· compressé" label
- Button "voir plus" to expand collapsed messages
- Add 24px spacing at end of feed to avoid last message clipping
- Simplify provider display: show name only, badge "active" instead of key status
- Dashboard: show provider name only without model suffix
- Studio /model: show just provider name, not model
- Z.AI (GLM): mark as crush-only, no external quota check
- Claude: check /usr/bin/claude installation instead of API

💘 Generated with Crush

web/src/styles/global.css

@@ -804,6 +804,12 @@ input::placeholder { color: var(--text-disabled); }
 .studio-token-fill { height: 100%; background: var(--accent); border-radius: 2px; transition: width 0.4s, background 0.3s; }
 .studio-token-fill.warn { background: var(--warning); }
 .studio-token-fill.compressed { height: 2px; }
+.studio-token-fill.animating { animation: compress-pulse 0.6s ease-in-out; }
+@keyframes compress-pulse {
+  0% { height: 3px; opacity: 1; }
+  50% { height: 5px; opacity: 0.8; background: var(--accent-light); }
+  100% { height: 2px; opacity: 1; }
+}
 .studio-token-text { font-size: 10px; font-family: var(--font-mono); color: var(--text-tertiary); white-space: nowrap; }
 .studio-token-text.compressed { font-size: 9px; }
 .studio-token-track.compressed { height: 2px; }