Thumbnails: Media's job failing (5xx) is 'no picture yet' (200, remembered 5 min), not Media's 500 in every visitor's console; Donate window skips the balance while signed out (a 401 in the console) (#187)

ddiff --git a/public/js/vibes.js b/public/js/vibes.js
iindex 3a5b7725..bd027ffd 100644
---- a/public/js/vibes.js
++++ b/public/js/vibes.js
@@@ -253,7 +253,7 @@ function openvibeBucksDonateModal() {
  async function _initDonateModal() {
      const streamerId = _donateStreamerId();
      const [bal, directAvailable] = await Promise.all([
--        api('/funds/balance').then(d => Math.round(d.balance || 0)).catch(() => null),
++        currentUser ? api('/funds/balance').then(d => Math.round(d.balance || 0)).catch(() => null) : null,
          streamerId
              ? api(`/powerchat/donate-link?streamer_id=${streamerId}`).then(d => !!(d && d.mode === 'direct')).catch(() => false)
              : Promise.resolve(false),
ddiff --git a/server/media-proxy/thumbnails.js b/server/media-proxy/thumbnails.js
iindex 0baf70ed..16aab6f2 100644
---- a/server/media-proxy/thumbnails.js
++++ b/server/media-proxy/thumbnails.js
@@@ -87,8 +87,12 @@ async function generateFor(kind, id, req, res) {
          if (noPictureKnown(key)) return res.json({ thumbnail_url: null });
          let out;
          try { out = await media.generateThumbnail(kind, id); } catch (err) {
--            if (!(err && err.name === 'MediaApiError' && (err.status === 404 || err.status === 429))) throw err;
--            rememberNoPicture(key, err.status === 429 ? MEDIA_BUSY_MS : NO_PICTURE_MS);
++            // Media's job failing (5xx) is Media's to fix, not this visitor's error: no picture for now, asked
++            // again after a while (clip 455's job failed on every /@goosely visit until Media#136, 2026-10-17).
++            const failed = err && err.name === 'MediaApiError' && err.status >= 500;
++            if (!(err && err.name === 'MediaApiError' && (err.status === 404 || err.status === 429 || failed))) throw err;
++            if (failed) console.warn(`[Thumbnails] Media's thumbnail job failed for ${key}: ${err.status}${err.body && err.body.job_id ? ` (${err.body.job_id})` : ''}`);
++            rememberNoPicture(key, err.status === 404 ? NO_PICTURE_MS : MEDIA_BUSY_MS);
              return res.json({ thumbnail_url: null });
          }
          const url = media.publicUrl(out?.url || meta.thumbnail_url);
ddiff --git a/test/thumbnail-no-picture.test.js b/test/thumbnail-no-picture.test.js
iindex 38269615..8f2d4292 100644
---- a/test/thumbnail-no-picture.test.js
++++ b/test/thumbnail-no-picture.test.js
@@@ -1,6 +1,7 @@
  'use strict';
  /**
-- * POST /api/thumbnails/generate/clip/:id when OpenVibe.Media answers with neither a picture nor a job: no picture yet,
++ * POST /api/thumbnails/generate/clip/:id when OpenVibe.Media answers with neither a picture nor a job, or its job fails
++ * (5xx): no picture yet,
   * answered 200 with thumbnail_url null and remembered for a while (Media is not asked again at once), never a 500 in
   * every visitor's console (the browser check of release 35d02c6b found one on /@goosely, clip 455).
   *
@@@ -36,6 +37,18 @@ console.warn = () => {};
      assert.strictEqual(again.status, 200);
      assert.strictEqual(asked, 1, 'remembered: Media is not asked again at once');
  
++    // Media's thumbnail job failing (it answers 500 with its job id): no picture for now, remembered, never the 500.
++    media.generateThumbnail = async () => {
++        asked++;
++        const err = new Error('Failed to generate thumbnail');
++        Object.assign(err, { name: 'MediaApiError', status: 500, body: { error: 'Failed to generate thumbnail', job_id: 'mjob_x' } });
++        throw err;
++    };
++    const failed = await post('/api/thumbnails/generate/clip/456');
++    assert.deepStrictEqual([failed.status, failed.json], [200, { thumbnail_url: null }]);
++    await post('/api/thumbnails/generate/clip/456');
++    assert.strictEqual(asked, 2, 'a failed job is remembered too');
++
      server.close();
      console.log('thumbnail no-picture: all checks passed');
      process.exit(0);