* fix(ui): place playlist context submenus flush to trigger row
Use left/right/top 100% instead of calc(100% + 4px) so there is no dead
gap when moving the pointer from Add to playlist into the submenu.
* fix(ui): defer closing playlist submenu on trigger mouseleave
Use a short timer and :hover on the trigger row so slow moves across
border/subpixel gaps still reach the nested submenu; cancel timer on
re-enter and when the context menu closes.
111 of 122 top-level src/utils/ files move into 16 topic folders (audio,
cache, cover, share, server, playback, playlist, deviceSync, waveform,
mix, format, export, changelog, ui, perf, componentHelpers). True
singletons with no cluster stay at the utils/ root.
Pure file-move: a path-aware codemod rewrote 539 relative-import
specifiers across 275 files; no logic touched. The hot-path coverage
gate list (.github/frontend-hot-path-files.txt) is updated to the new
paths for the 11 gated utils files — a mechanical consequence of the
move, not a CI change. tsc is green.
cucadmuh
Frank Stellmacher