feat(20-02): add adapter labels and unsupported install guard to SkillBrowser

- Import getUIAdapter and resolveAdapterSkillConfig/listAdapterSkillConfigs
- Show adapter type label in parentheses next to agent name in Installed tab selector
- Show adapter type label in install dialog agent list
- Guard handleInstallForAgent: show unsupportedMessage if adapter does not support install
- Dismissible error alert in install dialog for unsupported adapter attempts
- Clear unsupportedMessage on dialog open/close
- Compute COMPATIBLE_ADAPTER_LABELS at module level for Task 2

ui/src/pages/SkillBrowser.tsx

@@ -38,6 +38,13 @@ import { PageTabBar } from "@/components/PageTabBar";
 import { PageSkeleton } from "@/components/PageSkeleton";
 import { Identity } from "@/components/Identity";
 import { cn } from "@/lib/utils";
+import { getUIAdapter } from "@/adapters";
+import { resolveAdapterSkillConfig, listAdapterSkillConfigs } from "@paperclipai/adapter-utils";
+
+// Compute compatible adapter labels once at module level (used by Browse/Trending SkillCards)
+const COMPATIBLE_ADAPTER_LABELS = listAdapterSkillConfigs()
+  .filter((c) => c.supportsInstall)
+  .map((c) => getUIAdapter(c.adapterType).label);
 
 type SortBy = "rating" | "name" | "recent";
 
@@ -62,6 +69,7 @@ export function SkillBrowser() {
   // Dialog state
   const [installDialog, setInstallDialog] = useState<{ skillId: string; isUpdate?: boolean } | null>(null);
   const [uninstallDialog, setUninstallDialog] = useState<{ skillId: string; agentId: string } | null>(null);
+  const [unsupportedMessage, setUnsupportedMessage] = useState<string | null>(null);
 
   useEffect(() => {
     setBreadcrumbs([
@@ -253,6 +261,16 @@ export function SkillBrowser() {
 
   const handleInstallForAgent = (agentId: string) => {
     if (!installDialog) return;
+    const agent = agents.find((a) => a.id === agentId);
+    if (agent) {
+      const cfg = resolveAdapterSkillConfig(agent.adapterType ?? "process");
+      if (!cfg.supportsInstall) {
+        setUnsupportedMessage(
+          cfg.unsupportedReason ?? "This adapter does not support skill installation."
+        );
+        return;
+      }
+    }
     if (installDialog.isUpdate) {
       updateMutation.mutate({ skillId: installDialog.skillId, agentId });
     } else {
@@ -413,6 +431,9 @@ export function SkillBrowser() {
                       onClick={() => setSelectedAgentId(agent.id)}
                     >
                       <Identity name={agent.name} size="sm" />
+                      <span className="text-muted-foreground ml-1 text-xs">
+                        ({getUIAdapter(agent.adapterType ?? "process").label})
+                      </span>
                     </Button>
                   ))}
                 </div>
@@ -432,6 +453,14 @@ export function SkillBrowser() {
                   </Button>
                   <span className="text-sm font-medium">
                     {agents.find((a) => a.id === selectedAgentId)?.name ?? selectedAgentId}
+                    {(() => {
+                      const a = agents.find((ag) => ag.id === selectedAgentId);
+                      return a ? (
+                        <span className="text-muted-foreground ml-1 text-xs font-normal">
+                          ({getUIAdapter(a.adapterType ?? "process").label})
+                        </span>
+                      ) : null;
+                    })()}
                   </span>
                 </div>
 
@@ -573,7 +602,10 @@ export function SkillBrowser() {
       <Dialog
         open={!!installDialog}
         onOpenChange={(open) => {
-          if (!open) setInstallDialog(null);
+          if (!open) {
+            setInstallDialog(null);
+            setUnsupportedMessage(null);
+          }
         }}
       >
         <DialogContent>
@@ -584,6 +616,15 @@ export function SkillBrowser() {
             </DialogDescription>
           </DialogHeader>
           <div className="space-y-3">
+            {unsupportedMessage && (
+              <div className="rounded-md border border-destructive/50 bg-destructive/10 p-3 text-sm">
+                <p className="font-medium text-destructive">Cannot install on this agent</p>
+                <p className="text-muted-foreground mt-1">{unsupportedMessage}</p>
+                <Button variant="ghost" size="sm" className="mt-2" onClick={() => setUnsupportedMessage(null)}>
+                  Dismiss
+                </Button>
+              </div>
+            )}
             <div className="space-y-1">
               {agents.length === 0 && (
                 <p className="text-sm text-muted-foreground">No agents found in this workspace.</p>
@@ -597,6 +638,9 @@ export function SkillBrowser() {
                   onClick={() => handleInstallForAgent(agent.id)}
                 >
                   <Identity name={agent.name} size="sm" />
+                  <span className="text-muted-foreground ml-1 text-xs">
+                    ({getUIAdapter(agent.adapterType ?? "process").label})
+                  </span>
                 </Button>
               ))}
             </div>
@@ -604,7 +648,10 @@ export function SkillBrowser() {
           <DialogFooter>
             <Button
               variant="outline"
-              onClick={() => setInstallDialog(null)}
+              onClick={() => {
+                setInstallDialog(null);
+                setUnsupportedMessage(null);
+              }}
             >
               Cancel
             </Button>