feat(wiki): open source view on card click (wiki viewer or normal view)

Clicking a source card opens its view via the existing setDocumentToView handler (wiki -> WikiViewer, nested -> FileTree/ConnectorTree, else -> Chunks). The 3-dots Button and both DropdownMenuContent menus stopPropagation so clicks on the trigger or menu items don't bubble (through the React tree, even though Radix portals them) to the card's onClick. Adds cursor + keyboard/role a11y matching AgentCard.

frontend/src/settings/Sources.tsx

@@ -561,7 +561,17 @@ export default function Sources({
                 return (
                   <div key={docId} className="relative">
                     <div
-                      className={`bg-muted dark:bg-accent flex h-[130px] w-full flex-col rounded-2xl p-5 transition-all duration-200 ${
+                      role="button"
+                      tabIndex={0}
+                      aria-label={document.name}
+                      onClick={() => setDocumentToView(document)}
+                      onKeyDown={(e) => {
+                        if (e.key === 'Enter' || e.key === ' ') {
+                          e.preventDefault();
+                          setDocumentToView(document);
+                        }
+                      }}
+                      className={`bg-muted dark:bg-accent focus-visible:ring-ring/50 flex h-[130px] w-full cursor-pointer flex-col rounded-2xl p-5 transition-all duration-200 outline-none focus-visible:ring-[3px] ${
                         actionMenuDocId === docId ||
                         syncMenuState.docId === docId
                           ? 'scale-[1.05]'
@@ -601,6 +611,7 @@ export default function Sources({
                                 <DropdownMenuContent
                                   align="end"
                                   className="min-w-[120px]"
+                                  onClick={(e) => e.stopPropagation()}
                                 >
                                   {syncOptions.map((opt) => (
                                     <DropdownMenuItem
@@ -641,6 +652,7 @@ export default function Sources({
                               <DropdownMenuContent
                                 align="end"
                                 className="min-w-[144px]"
+                                onClick={(e) => e.stopPropagation()}
                               >
                                 {getActionOptions(index, document).map(
                                   (option, idx) => (