feat(chat): rich shared-media view, status selector, drag-drop upload + fixes

Chat / shared media:
- Media/Docs/Links: clean underline tabs (green active), audio & video now
  classified as Media and rendered as tiles (download + headphone/play +
  duration) instead of broken-image glyphs; image thumbnails -> lightbox
- Drag-and-drop a file/video/image onto a conversation to send it
- Fix: removed #chatPanel{position:relative} override that collapsed the
  conversation pane (messages spilled into a clipped right-edge strip)
- "Media, links & docs" row cleaned up (no folder/placeholder icon); media
  popup keeps the back arrow, drops the redundant close button

Presence / status:
- Single current-status row with an arrow that expands Available/Away/On leave
- On leave = circle with minus, In a call = solid red indicators
- Fix: selected-status tick now follows the chosen option

Icons: added headphones + play; bumped icons.js cache-bust to v4

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

server/public/icons.js

@@ -6,7 +6,12 @@
     screenShare: '<path d="M13 3H4a2 2 0 0 0-2 2v10a2 2 0 0 0 2 2h16a2 2 0 0 0 2-2v-3"/><path d="M8 21h8"/><path d="M12 17v4"/><path d="m17 8 5-5"/><path d="M17 3h5v5"/>',
     wifi:        '<path d="M12 20h.01"/><path d="M8.5 16.4a5 5 0 0 1 7 0"/><path d="M5 12.9a10 10 0 0 1 14 0"/><path d="M2 8.8a15 15 0 0 1 20 0"/>',
     video:       '<path d="m22 8-6 4 6 4V8Z"/><rect width="14" height="12" x="2" y="6" rx="2" ry="2"/>',
+    videoOff:    '<path d="M10.66 6H14a2 2 0 0 1 2 2v2.34l1 1L22 8v8"/><path d="M16 16a2 2 0 0 1-2 2H4a2 2 0 0 1-2-2V8a2 2 0 0 1 2-2h2l10 10Z"/><line x1="2" x2="22" y1="2" y2="22"/>',
+    image:       '<rect width="18" height="18" x="3" y="3" rx="2" ry="2"/><circle cx="9" cy="9" r="2"/><path d="m21 15-3.086-3.086a2 2 0 0 0-2.828 0L6 21"/>',
+    folder:      '<path d="M20 20a2 2 0 0 0 2-2V8a2 2 0 0 0-2-2h-7.9a2 2 0 0 1-1.69-.9L9.6 3.9A2 2 0 0 0 7.93 3H4a2 2 0 0 0-2 2v13a2 2 0 0 0 2 2Z"/>',
     paperclip:   '<path d="m21.44 11.05-9.19 9.19a6 6 0 0 1-8.49-8.49l8.57-8.57A4 4 0 1 1 18 8.84l-8.59 8.57a2 2 0 0 1-2.83-2.83l8.49-8.48"/>',
+    headphones:  '<path d="M3 14h3a2 2 0 0 1 2 2v3a2 2 0 0 1-2 2H5a2 2 0 0 1-2-2v-7a9 9 0 0 1 18 0v7a2 2 0 0 1-2 2h-1a2 2 0 0 1-2-2v-3a2 2 0 0 1 2-2h3"/>',
+    play:        '<polygon points="6 3 20 12 6 21 6 3"/>',
     smile:       '<circle cx="12" cy="12" r="10"/><path d="M8 14s1.5 2 4 2 4-2 4-2"/><line x1="9" x2="9.01" y1="9" y2="9"/><line x1="15" x2="15.01" y1="9" y2="9"/>',
     smilePlus:   '<path d="M22 11v1a10 10 0 1 1-9-10"/><path d="M8 14s1.5 2 4 2 4-2 4-2"/><line x1="9" x2="9.01" y1="9" y2="9"/><line x1="15" x2="15.01" y1="9" y2="9"/><path d="M16 5h6"/><path d="M19 2v6"/>',
     reply:       '<polyline points="9 14 4 9 9 4"/><path d="M20 20v-7a4 4 0 0 0-4-4H4"/>',
@@ -34,6 +39,9 @@
     calendar:    '<path d="M8 2v4"/><path d="M16 2v4"/><rect width="18" height="18" x="3" y="4" rx="2"/><path d="M3 10h18"/>',
     pencil:      '<path d="M21.17 6.83a2.83 2.83 0 0 0-4-4L3.84 16.17a2 2 0 0 0-.5.83l-1.32 4.35a.5.5 0 0 0 .62.62l4.35-1.32a2 2 0 0 0 .83-.5z"/><path d="m15 5 4 4"/>',
     chevronDown:    '<path d="m6 9 6 6 6-6"/>',
+    chevronUp:      '<path d="m18 15-6-6-6 6"/>',
+    star:        '<path d="M11.525 2.295a.53.53 0 0 1 .95 0l2.31 4.679a2.123 2.123 0 0 0 1.595 1.16l5.166.756a.53.53 0 0 1 .294.904l-3.736 3.638a2.123 2.123 0 0 0-.611 1.878l.882 5.14a.53.53 0 0 1-.771.56l-4.618-2.428a2.122 2.122 0 0 0-1.973 0L6.396 21.01a.53.53 0 0 1-.77-.56l.881-5.139a2.122 2.122 0 0 0-.611-1.879L2.16 9.795a.53.53 0 0 1 .294-.906l5.165-.755a2.122 2.122 0 0 0 1.597-1.16z"/>',
+    link:        '<path d="M10 13a5 5 0 0 0 7.54.54l3-3a5 5 0 0 0-7.07-7.07l-1.72 1.71"/><path d="M14 11a5 5 0 0 0-7.54-.54l-3 3a5 5 0 0 0 7.07 7.07l1.71-1.71"/>',
     layoutDashboard:'<rect width="7" height="9" x="3" y="3" rx="1"/><rect width="7" height="5" x="14" y="3" rx="1"/><rect width="7" height="9" x="14" y="12" rx="1"/><rect width="7" height="5" x="3" y="16" rx="1"/>',
     arrowRight:  '<path d="M5 12h14"/><path d="m12 5 7 7-7 7"/>',
     alertTriangle:'<path d="m21.73 18-8-14a2 2 0 0 0-3.48 0l-8 14A2 2 0 0 0 4 21h16a2 2 0 0 0 1.73-3z"/><path d="M12 9v4"/><path d="M12 17h.01"/>',