refactor(dashboard): change SpawnModal from overlay modal to dropdown

Position the spawn modal directly under the 'New Agent' button without a
blur overlay. Uses click-outside dismissal and absolute positioning.
Reduces visual disruption for quick agent spawning.

dashboard/components/SessionCard.js

@@ -110,9 +110,9 @@ export function SessionCard({ session, onClick, conversation, onFetchConversatio
               <span class="rounded-full border px-2.5 py-1 font-mono text-micro uppercase tracking-[0.14em] ${agent === 'codex' ? 'border-emerald-400/45 bg-emerald-500/14 text-emerald-300' : 'border-violet-400/45 bg-violet-500/14 text-violet-300'}">
                 ${agent}
               </span>
-              ${session.cwd && html`
+              ${session.project_dir && html`
                 <span class="truncate rounded-full border border-selection bg-bg/40 px-2.5 py-1 font-mono text-micro text-dim">
-                  ${session.cwd.split('/').slice(-2).join('/')}
+                  ${session.project_dir.split('/').slice(-2).join('/')}
                 </span>
               `}
             </div>