fix: harden media handoff and live logs

Reject stale extension media cookie headers before yt-dlp metadata work, preserve ordinary capture cookies, and advance the companion extension.

Stream redacted diagnostic logs only while the visible Logs view is active, with bounded batched updates and race-safe snapshot handoff.

src/components/AddDownloadsModal.tsx

@@ -120,9 +120,8 @@ export const AddDownloadsModal = () => {
     if (context) return extensionHeaders(context).trim();
     return hasExtensionRequestContext ? '' : headers.trim();
   };
-  const cookiesForRow = (sourceUrl: string, omitRequestCookies = false) => {
+  const cookiesForRow = (sourceUrl: string) => {
     if (cookiesManuallyEditedRef.current) return cookies.trim();
-    if (omitRequestCookies) return '';
     const context = requestContextForUrl(sourceUrl);
     if (context) return context.cookies.trim();
     return hasExtensionRequestContext ? '' : cookies.trim();
@@ -303,25 +302,7 @@ export const AddDownloadsModal = () => {
               cookies: rowCookies || null,
               proxy
             };
-            let requestCookiesOmitted = false;
-            let mediaData;
-            try {
-              mediaData = await fetchMediaMetadataDeduped(mediaMetadataArgs);
-            } catch (error) {
-              const capturedCookies = requestContextForUrl(row.sourceUrl)?.cookies.trim();
-              if (!rowCookies || !capturedCookies || cookiesManuallyEditedRef.current) {
-                throw error;
-              }
-              console.warn(
-                'Media metadata rejected the captured Cookie header; retrying without request cookies',
-                error
-              );
-              mediaData = await fetchMediaMetadataDeduped({
-                ...mediaMetadataArgs,
-                cookies: null
-              });
-              requestCookiesOmitted = true;
-            }
+            const mediaData = await fetchMediaMetadataDeduped(mediaMetadataArgs);
             if (mediaData && mediaData.formats.length > 0) {
               const mappedFormats = mediaData.formats.map(f => {
                 const quality = f.resolution || 'Video';
@@ -353,7 +334,6 @@ export const AddDownloadsModal = () => {
                   size: mappedFormats[0].bytes ? mappedFormats[0].detail : undefined,
                   sizeBytes: mappedFormats[0].bytes || undefined,
                   status: 'ready',
-                  requestCookiesOmitted,
                   formats: mappedFormats,
                   selectedFormat: 0
                 })
@@ -729,7 +709,7 @@ export const AddDownloadsModal = () => {
           checksum: checksumEnabled && checksumValue.trim()
             ? `${checksumAlgo}=${checksumValue.trim()}`
             : undefined,
-          cookies: cookiesForRow(item.sourceUrl, item.requestCookiesOmitted) || undefined,
+          cookies: cookiesForRow(item.sourceUrl) || undefined,
           mirrors: mirrors.trim() || undefined,
           destination: useSharedDestination
             ? finalLocation
@@ -1148,11 +1128,6 @@ export const AddDownloadsModal = () => {
                         className="add-download-control w-full px-3 py-1.5 text-xs font-mono"
                         aria-label="Cookies"
                       />
-                      {!cookiesManuallyEditedRef.current && parsedItems.some(item => item.requestCookiesOmitted) && (
-                        <p className="mt-1 text-[10px] text-amber-400">
-                          Media metadata only worked without the captured cookies, so they will be omitted for affected rows. Edit this field to force a manual value.
-                        </p>
-                      )}
                     </div>
                     <div>
                       <label className="block text-[10px] uppercase font-bold tracking-wider text-text-muted mb-1">Mirrors</label>