fix: runtime lane button overflow — flex-wrap + smaller buttons

The welcome-remote-row had 4 runtime buttons (Hermes, OpenClaw, IronClaw,
Raven) in a 420px max-width card with no flex-wrap, causing the 4th button
(Raven EverMind) to overflow the card border.

Fix:
- Added flex-wrap: wrap to .welcome-remote-row so buttons wrap to a new line
- Added smaller font-size (12px) and tighter padding (6px 12px) for runtime
  lane buttons to help them fit on one line when possible
- Added white-space: nowrap so button labels don't break mid-word

Verified: typecheck pass, 115/115 test files, 1300 tests passed

Author: Developer

agent-desktop/src/renderer/src/assets/main.css

@@ -820,10 +820,17 @@ select:focus-visible {
 
 .welcome-remote-row {
   display: flex;
+  flex-wrap: wrap;
   gap: 8px;
   align-items: center;
 }
 
+.welcome-remote-row .btn {
+  font-size: 12px;
+  padding: 6px 12px;
+  white-space: nowrap;
+}
+
 .welcome-remote-row--spaced {
   margin-top: 16px;
 }