fix(panel): surface mam-api clip-push error body instead of bare HTTP 400

API.pushClips threw 'Clip push HTTP 400' and discarded the response body,
hiding the server's specific reason (e.g. "All clip assets must belong to
the sequence's project"). Now parse and include the {error} text so conform
failures are actionable. No behaviour change to the recorder/capture path.

services/premiere-plugin-uxp/src/api.js

@@ -1,4 +1,4 @@
-// Dragonflight API client — v2.1.4
+// Dragonflight API client — v2.1.5
 // UXP fetch() notes:
 //   • redirect:'manual' is NOT a supported option — UXP auto-follows redirects
 //   • Authorization is stripped by UXP on cross-origin redirects (security fix)
@@ -31,6 +31,21 @@
 
   function trimUrl(u) { return String(u || '').replace(/\/+$/, ''); }
 
+  // Pull the human-readable error string out of an API error response.
+  // mam-api returns { error: "..." } (sometimes with a code); fall back to
+  // the raw text, then to the HTTP status line.
+  async function _errText(r) {
+    const raw = await r.text().catch(() => '');
+    if (raw) {
+      try {
+        const j = JSON.parse(raw);
+        if (j && (j.error || j.message)) return j.error || j.message;
+      } catch (_) { /* not JSON — use raw */ }
+      return raw.slice(0, 240);
+    }
+    return 'HTTP ' + r.status;
+  }
+
   // Core request — adds Bearer only for same-server URLs.
   // No redirect option — UXP handles redirects automatically.
   API.request = async function (urlOrPath, opts) {
@@ -143,7 +158,11 @@
       headers: { 'Content-Type': 'application/json' },
       body: JSON.stringify(clips),
     });
-    if (!r.ok) throw new Error('Clip push HTTP ' + r.status);
+    if (!r.ok) {
+      // Surface the server's real reason (e.g. cross-project asset, bad frame
+      // fields) instead of a bare status code — conform failures were opaque.
+      throw new Error('Clip push failed (HTTP ' + r.status + '): ' + (await _errText(r)));
+    }
     return r.json();
   };