fix(percy): clone always creates build — falls back to screenshot copy

When snapshot names aren't URLs (most builds), the clone was stopping
and asking the user to provide URLs. Now it automatically falls
through to screenshot copy mode which always works.

Logic: URL names → Percy CLI replay. No URLs → screenshot copy.
Never stops without creating a build.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

Author: DeRaowl

src/tools/percy-mcp/v2/clone-build.ts

@@ -235,18 +235,25 @@ export async function percyCloneBuildV2(
     }
   }
 
-  // ── Step 4: Check if Percy CLI is available for URL replay ────────────
+  // ── Step 4: Determine clone mode ────────────────────────────────────────
+
+  // Check if snapshots have URL names (web builds where name IS the URL)
+  const hasUrlNames = snapshots.some(
+    (s) => s.name.startsWith("http://") || s.name.startsWith("https://"),
+  );
 
   let hasCli = false;
-  try {
-    await execFileAsync("npx", ["@percy/cli", "--version"]);
-    hasCli = true;
-  } catch {
-    hasCli = false;
+  if (hasUrlNames) {
+    try {
+      await execFileAsync("npx", ["@percy/cli", "--version"]);
+      hasCli = true;
+    } catch {
+      hasCli = false;
+    }
   }
 
-  if (hasCli && buildType === "web") {
-    // ── URL Replay mode: use Percy CLI to re-snapshot ─────────────────
+  if (hasCli && hasUrlNames && buildType === "web") {
+    // URL Replay: Percy CLI re-snapshots with full resources
     return await replayWithPercyCli(
       output,
       snapshots,
@@ -255,7 +262,7 @@ export async function percyCloneBuildV2(
       args.target_project_name,
     );
   } else {
-    // ── Screenshot copy mode: download and re-upload images ───────────
+    // Screenshot copy: always works — downloads and re-uploads images
     return await copyScreenshots(output, snapshots, targetToken, branch);
   }
 }