Also tightens stat/post-video rendering so "0" prints as "0" and not
"0.0" (Number::abbreviate(0, precision: 1) stringifies as "0.0", which
leaked into the About tab's Total Views card and post-video badges).
Four tests covering:
- /@username opens the matching channel.
- /@invalid url (space) 404s.
- Owner view shows id="postForm"; preview?preview=1 hides it.
- Zero-view playlist doesn't render "bi-eye … 0.0"; "1 videos" never
renders in place of "1 video".
Fixed a Blade dupe-declaration fatal that only fired in feature tests
(two requests in one PHP process would redeclare notifVal()). Guarded
with function_exists.
Co-Authored-By: Claude Opus 4.7 (1M context) <[email protected]>
