refactor(theme-studio): hoist the browser-gate boilerplate into a gate() helper

The 38 standard gates each repeated the same ok flag, notes list, A(cond,note)
collector, and verdict postamble (title + result div), with the note separator
drifted across them (' | ' vs ' fails='). gate(id, body) owns all of it and
standardizes the note format to ' fails=note1,note2'; the gate name is the hash
uppercased, the div id is the hash, matching what each gate set by hand. Each
call site keeps its literal location.hash==='#NAMEtest' (run-tests.sh greps that
to discover gates). Six custom gates (selftest, cursortest, planetest, oklchtest,
readouttest, savetest) stay inline. Verified: all 44 gates green, and a forced
A(false) in a converted gate still reports FAIL (gate() can't manufacture greens).

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