Three long-press features

[sastraxi]

Long-press emits a raw MIDI CC

longpress: {midi_CC: 64}

Fires RawMidiCcEffect(channel, cc) on long-press. First press sends 127, alternates thereafter. Uses fs.midi_channel + the dict's midi_CC; the footswitch's midi_CC (sibling to longpress) remains scoped to short-press. The footswitch LED stays in its PRESS role; the plugin tile reconciles via mod-ui's WS echo.

Long-press selects a snapshot

longpress: {preset: 2}
longpress: {preset: UP}
longpress: {preset: DOWN}

Reuses the existing PresetEffect on a LONGPRESS row. Specific index → preset_set_and_change; UP/DOWN → incr/decr.

Long-press scrolls pedalboards in-bank

longpress: {pedalboard: UP}
longpress: {pedalboard: DOWN}

New PedalboardEffect walks the current bank's ordered list with wraparound, falling back to the full alphabetical pedalboard_list when no bank is set.

Supporting changes

• Config schema: longpress now accepts the object form (mutually-exclusive keys), and toggle_tuner_enable was added to the string enum (pre-existing drift)
• Refactor: the O(N²) bank title→Pedalboard lookup is now a shared pedalboards_in_bank() on the handler; the LCD pedalboard menu uses it