Settings › Radio and Tools › Repeater had near-identical preset-picker
logic (name/list-index lookup, save/delete, popup build, selection
handling) plus their own copy of the nearest-bandwidth search — only the
target fields (companion params vs. dedicated repeater profile) and the
apply call differed.
Extract the shared logic into RadioPresetPicker (a Target of field
pointers + a Result the screen acts on), with no dependency on UITask so
each screen keeps its own apply/dirty/keyboard/alert handling. Move the
nearest-bandwidth search to nearestBwIndex() in RadioPresets.h. Removes
~6 duplicated methods and 4 state fields from each screen.
Verified: WioTrackerL1_companion_solo_dual builds clean.
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
