Site 1.2.0: rgb_waveform is now Advanced waveforms

Renamed everywhere (builder, pages, data); the built update is byte for byte
the same. Upcoming: UTILITY > WAVEFORM (BLUE / RGB / 3BAND) in testing. The
generator builds the released state only (patch(..., public=True)).

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

builder/ui.js

@@ -7,7 +7,7 @@
       what: 'BPM with two decimals: the tenths as a small digit above, the hundredths below.' },
     { id: 'phasemeter', name: 'Phase meter', by: 'arnoldasr', state: 'stable',
       what: 'Two-line phase meter instead of the four boxes; UTILITY › PHASE METER (was SLIP FLASHING) switches it.' },
-    { id: 'rgb_waveform', name: 'RGB waveform', by: 'arnoldasr', state: 'stable',
+    { id: 'advanced_waveforms', name: 'Advanced waveforms', by: 'arnoldasr', state: 'stable',
       what: 'The big waveform in RGB colours, the overview as a red-to-white gradient.' },
     { id: 'beatjump', name: 'Beat jump', by: 'ours', state: 'experimental', needs: 'hotcuekeys',
       what: 'TRACK SEARCH ◀◀ ▶▶ jumps 1/2/4/8 beats along the beat grid, at once and in phase. UTILITY › BEAT JUMP (was SCREEN SAVER).' },