[pfeerick]

Closes #589. Adds a per-model USB mode that overrides the radio setting, modelled on the ADC jitter filter option.

What it does

• New model setting USB mode: Global / Ask / Joystick / Storage / Serial. New models default to Global, which uses the radio setting. Any other value takes priority when USB is plugged in.
• The mode is resolved at plug-in time, so switching models while connected keeps the current session. The new model's setting applies on the next connect. If a model selects Serial on a target without USB serial, it falls back to Ask.

Changes

• Data: ModelData::usbMode:3 (ModelUsbMode enum, 0 = Global, otherwise radio usbMode + 1). YAML structures were regenerated for all targets. The colorlcd ModelData CHKSIZE grows by 1 byte; B&W is unchanged.
• Firmware: getModelUsbMode() in main.cpp replaces the direct g_eeGeneral.USBMode read in handleUsbConnection().
• Model setup: a USB mode row after the ADC filter: colorlcd Other section, and B&W model setup (128x64 and 212x64).
• Override hints: radio setup (USB mode) and radio hardware (ADC filter) show when the current model overrides the radio setting:
  • colorlcd: Model - X next to the control, as for the view options.
  • B&W: a separate, non-selectable MODEL - X line under the setting, right-aligned, shown only while overridden (same mechanism as the "Overridden by SF/GF" lines). An inline hint doesn't fit every translation on B&W; this line fits all B&W languages with room to spare.
• Lua: model.getInfo() / model.setInfo() expose usbMode. Out-of-range values set Global.
• Companion: model data field, YAML read/write, and a USB mode combo in model setup (under Trim Switch).
• Translations:
  • New STR_MODEL_USBMODES, built from the existing USB mode strings plus a new shared TR_GLOBAL. No new words for translators.
  • The existing "Global" entries (ADC filter, switch types, hats) now use TR_GLOBAL where they were identical.
  • Real grammatical variants are kept: it plural, sk gender, jp/ko hats wording.
  • Untranslated English is fixed in the nl hats option and ko switch type.
  • Shorter B&W forms: Danish USB mode label (overlapped the 128x64 value column) and Swedish storage mode (ran off the 212x64 screen).

Testing

• Radio gtests pass: TX16S (242/242) and X9D+ (188/188)
• Bench tested on TX16S (colorlcd), T14 (128x64) and X9D+ 2019 (212x64) hardware
• Companion (macOS): UI checked; a model read/write cycle reads and writes the USB mode values back correctly

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