[skjnldsv]

A video whose codec the browser can't decode (HEVC in Chrome and Firefox on most systems, so most iPhone videos) loads without an error: the sound plays over a black screen, and nothing says why. Its metadata comes with no picture size, so the viewer now shows a small notice over the player and lets the sound play on.

It only shows for a video known to have a picture, from its preview or its MP4/MOV header, so a file with only sound gets no notice.

Fixes #108

Before	After

Checked with an HEVC .mov in Chromium. A WebM or MKV without a preview has no header we read, so it gets no notice.

👾 This pull request was assisted by Claude Code, commits carry an Assisted-by trailer.

[codecov]

Codecov Report

❌ Patch coverage is 90.00000% with 1 line in your changes missing coverage. Please review.
✅ Project coverage is 92.02%. Comparing base (bf78e93) to head (cbca687).

Files with missing lines	Patch %	Lines
lib/components/Videos.vue	90.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #178      +/-   ##
==========================================
- Coverage   92.03%   92.02%   -0.01%     
==========================================
  Files          54       54              
  Lines        4607     4617      +10     
  Branches     1002     1006       +4     
==========================================
+ Hits         4240     4249       +9     
- Misses        342      343       +1     
  Partials       25       25              

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