fix(Avatar): fall back to initials when imageUrl is an empty string

[oliverlaz]

🎯 Goal

Prevent the Avatar component from rendering an <img> element with an empty src when imageUrl is an empty string. An empty src makes the browser attempt to load the current document URL as an image, which both wastes a request and triggers an unintended onError (which would then flip the avatar into the error fallback for the wrong reason).

🛠 Implementation details

showImage previously only checked that imageUrl was a string. An empty string passes typeof imageUrl === 'string', so the <img> was rendered with src="". Added a truthy check so an empty string now falls through to the initials/icon fallback path. Added a regression test for the empty-string case.

🎨 UI Changes

No visual changes for valid image URLs. When imageUrl="", the avatar now renders the username initials (or IconUser fallback) instead of a broken <img>.

[github-actions]

Size Change: +10 B (0%)

Total Size: 673 kB

📦 View Changed

Filename	Size	Change
dist/cjs/index.js	267 kB	+5 B (0%)
dist/es/index.mjs	265 kB	+5 B (0%)

ℹ️ View Unchanged

Filename	Size
dist/cjs/audioProcessing.js	1.32 kB
dist/cjs/emojis.js	3.01 kB
dist/cjs/mp3-encoder.js	1.27 kB
dist/cjs/useNotificationApi.js	45.4 kB
dist/css/emoji-picker.css	178 B
dist/css/emoji-replacement.css	456 B
dist/css/index.css	39.6 kB
dist/es/audioProcessing.mjs	1.31 kB
dist/es/emojis.mjs	2.52 kB
dist/es/mp3-encoder.mjs	756 B
dist/es/useNotificationApi.mjs	45.2 kB

_{compressed-size-action}

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 83.50%. Comparing base (88c0ccc) to head (1f5187e).

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #3168      +/-   ##
==========================================
- Coverage   83.55%   83.50%   -0.05%     
==========================================
  Files         434      434              
  Lines       12949    12949              
  Branches     4170     4170              
==========================================
- Hits        10819    10813       -6     
- Misses       2130     2136       +6     

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