fix: wire conversation panel to DAG nodes with toggle support

- Add MessageSquare icon to GraphNodeCard; prop-thread onConversationOpen
  and selectedTaskId through WorkflowGraph node data (no useUrlState
  inside ReactFlow nodes — avoids context/timing issues)
- Fix ContextualRightPanel: check taskId before epicId so clicking the
  conversation icon always opens ThreadDrawer even when an epic filter
  is active
- setEpicId now clears task from URL so selecting an epic resets any
  open conversation thread
- handleGraphSelect toggles: second click on same node calls setTaskId(null)
  closing the right panel
- Add onSelect to WorkflowGraph flowModel deps to prevent stale callbacks
- Fix ContextualRightPanel onClose no-ops: wired to setTaskId(null) /
  setSwarmId(null) so back button works
- Right panel always visible (removed panel==='open' gate in UnifiedShell)
- SmartDag task grid: horizontal scroll, fixed-width cards, hideClosed=true
- Add <Suspense> in page.tsx for useSearchParams compatibility
- Enable dolt auto-start in .beads/config.yaml
- Add 14 static analysis tests (graph-node-conversation.test.tsx)

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

src/components/shared/unified-shell.tsx

@@ -63,9 +63,14 @@ export function UnifiedShell({
   const selectedIssue = taskId ? issues.find((issue) => issue.id === taskId) ?? null : null;
 
   const handleGraphSelect = useMemo(() => (id: string) => {
-    setTaskId(id);
-    setCustomRightPanel(null); // Reset when switching context
-  }, [setTaskId]);
+    // Toggle: clicking the same node again closes the conversation panel
+    if (taskId === id) {
+      setTaskId(null);
+    } else {
+      setTaskId(id);
+    }
+    setCustomRightPanel(null);
+  }, [taskId, setTaskId]);
 
   const handleCardSelect = useMemo(() => (id: string) => {
     if (view === 'social') {
@@ -203,17 +208,15 @@ export function UnifiedShell({
           {renderMiddleContent()}
         </div>
 
-        {/* RESIZE HANDLE: Right (only when panel open) */}
-        {panel === 'open' && <ResizeHandle direction="right" onResize={handleRightResize} />}
+        {/* RESIZE HANDLE: Right */}
+        <ResizeHandle direction="right" onResize={handleRightResize} />
 
-        {/* RIGHT PANEL */}
-        {panel === 'open' && (
-          <div style={{ width: rightWidth }} className="flex-shrink-0 overflow-hidden">
-            <RightPanel isOpen={true}>
-              {renderRightPanelContent()}
-            </RightPanel>
-          </div>
-        )}
+        {/* RIGHT PANEL: always visible, content adapts to selection */}
+        <div style={{ width: rightWidth }} className="flex-shrink-0 overflow-hidden">
+          <RightPanel isOpen={true}>
+            {renderRightPanelContent()}
+          </RightPanel>
+        </div>
       </div>
 
       {/* THREAD DRAWER: Popup overlay when a task is selected */}