1.0.20

Fix GitHub trending tab language filter and subtitle text (#38)

Selecting the "All" language chip after picking a specific language
(e.g. Kotlin) was a no-op: the chip listener only wrote the selected
language into request metadata when the chip wasn't "All", so the
stale language stayed in metadata and the list kept showing that
language's trending repos while the chip UI showed "All" selected.
Now selecting "All" clears the stored language so the request falls
back to all-languages trending, matching the chip UI.

Also fixes the topTitleText subtitle showing a stray leading "● " (or
literal "null") when a trending repo has no listed language or GitHub
doesn't report a "stars today" count for it.

Co-authored-by: Claude <noreply@anthropic.com>