chore: 2.11.8 backports

[pfeerick]

Tracking PR for commits backported from main onto 2.11 for the 2.11.8 release. Rebase-merge only. Please don't squash: the individual cherry-picked commit trail is the point.

Already on 2.11 (merged directly or backported earlier, no cherry-pick needed)

• fix(color): USB SD card mode may crash to emergency mode (#7657) #7678 fix(color): USB SD card mode may crash to emergency mode (fix(color): USB SD card mode may crash to emergency mode #7657)
• fix(cpn): audio does not play in the simulator #7685 fix(cpn): audio does not play in the simulator
• fix(cpn): inconsistent values for CRSF baudrate between radio and companion (2.12) #7675 fix(cpn): inconsistent values for CRSF baudrate between radio and companion
• fix(color): potential EM when moving trim to subtrim #7671 fix(color): potential EM when moving trim to subtrim
• chore(telem): unify antenna number with RSSI number for ELRS #7667 chore(telem): unify antenna number with RSSI number for ELRS
• fix(color): Outputs widget does not update after changing 'Extended Limits' #7662 fix(color): Outputs widget does not update after changing 'Extended Limits'
• feat(flysky): add build option to choose use SDIO or SPI flash if available #7635 feat(flysky): add build option to choose use SDIO or SPI flash if available
• fix(telem): CRSF RSSI uses incorrect default units #7622 fix(telem): CRSF RSSI uses incorrect default units
• fix(radio): addressable RGB LED signal left floating between frames #7620 fix(radio): addressable RGB LED signal left floating between frames

Backported commits

• fix(color): manage models buttons incorrect after renaming or removing labels #7705 fix(color): manage models buttons incorrect after renaming or removing labels
• fix(color): number edit keyboard is not sized to suit display and cursor position is wrong #7670 fix(color): number edit keyboard is not sized to suit display and cursor position is wrong
• fix(color): in manage models, long press on selected model button clears checked state #7707 fix(color): in manage models, long press on selected model button clears checked state
• fix(color): UI issues adding and removing labels #7715 fix(color): UI issues adding and removing labels
• fix(lua): compare float with int strictly in equality #7611 fix(lua): compare float with int strictly in equality
• fix(taranis): restore volume cli for I2C audio targets #6543 fix(taranis): restore volume cli for I2C audio targets
• chore(elrs): allow future use of unused bits in the "Arming status byte" #7022 chore(elrs): allow future use of unused bits in the "Arming status byte"
• fix(fw): trim is not applied when mix source is inverted #7779 fix(fw): trim is not applied when mix source is inverted
• fix(bw): potential Lua stack overflow in lcd.drawCombobox #7775 fix(bw): potential Lua stack overflow in lcd.drawCombobox
• fix(firmware): audio logic does not use all of the available buffers #7689 fix(firmware): audio logic does not use all of the available buffers. Hand-ported (not a plain cherry-pick): 2.11 already had its own fix for this in fix(sound): sound playing sometimes sluggish #7472 + fix(cpn): audio does not play in the simulator #7685, using a bufferFull flag that both the producer and the consumer write. This replaces it with upstream's design, where each side only writes its own counter, and also brings in the fragment FIFO fix. filledAtleast() is kept, although upstream removes it, because 2.11's simulator (simpgmspace.cpp) still uses it. fix(sound): sound playing sometimes sluggish #7472's DAC underrun handling is unchanged.
• chore(color): fix compile error if LUA_ALLOCATOR_TRACER is defined #7808 chore(color): fix compile error if LUA_ALLOCATOR_TRACER is defined
• fix(color): labels for a model may get truncated in 'labels.yml' file #7812 fix(color): labels for a model may get truncated in 'labels.yml' file
• chore(fw): replace unsafe calls to strAppend with copyToUnTerminated #7814 chore(fw): replace unsafe calls to strAppend with copyToUnTerminated. Hand-ported: dropped the yaml_datastructs_funcs.cpp hunk (r_cfs_name only exists on main, from feat(radio): refactor of switch handling to better support customisable switches #6095) and the modelslist_labels.cpp test hunk (that test doesn't exist on 2.11). The theme_manager.cpp and strhelpers.cpp changes apply unchanged.
• Add compile time option for xlite alt layout #2662 feat(xlite): add compile time option for alternative button layout. 2.11 only, not from main: an open community PR (its fork tracks main, so it couldn't be retargeted), squashed and hand-ported here. Pin definitions converted to the LL style (GPIOx / LL_GPIO_PIN_n), and TRIMS_VIRTUAL_RV/RH added to the alternative trim block so the virtual right-stick trims are still generated as in the stock X-Lite layout. It won't go to 2.12 or main.
• chore(color): remove unused LV_OBJ_FLAG_ENCODER_ACCEL define. #7809 chore(color): remove unused LV_OBJ_FLAG_ENCODER_ACCEL define. Hand-ported: dropped the radio_mic_recorder.cpp hunk (that file comes from the main-only MEMS microphone support, feat: MEMS microphone software handling for TX15 and TX16SMK3 #7328). Nothing on 2.11 reads the flag either (unused since fix(color): Rework rotary encoder acceleration calculation removing double handling #3441), so there's no behaviour change. Re-milestoned from 3.0 to 2.11.8 after this PR was opened, so it's appended after Add compile time option for xlite alt layout #2662 rather than placed in merge order.
• chore(ci): vendor dfu-util for the 2.11 Windows Companion build. 2.11 maintenance, not a backport. MSYS2 removed dfu-util from its mingw64 packages (MINGW-packages #31695, 2026-09-17), so every 2.11 Windows Companion build failed at pacman -S with "target not found". This vendors the last signed mingw64 build (0.11-2) and its .sig in .github/msys2/ and installs it with pacman -U after checkout, which still checks the signature. It also installs libusb explicitly, because the installer only bundles dfu-util.exe and libusb-1.0.dll when libusb is found, and adds .github/msys2/** to the Companion workflow's trigger paths. 2.12 and main don't need it, since they use rs_dfu (chore(cpn): refactor firmware flashing to use edgetx rs_dfu #6521).
• fix(stm32f4): Hangs during flashing firmware #7415 fix(stm32f4): Hangs during flashing firmware. Merged after this PR was opened, so it's appended after the CI fix. Hand-ported: the h750 and c14 board.h hunks are dropped (those boards don't exist on 2.11), the simulator stub change goes in simpgmspace.cpp (simulib.cpp is main-only, from feat: WASM modules based simulation in Companion #6435), and the colorlcd boot menu's new flash error screen uses lcd->, because 2.11's bootloader lcd is a BitmapBuffer*. Same code as the release-test build in test: 2.11.8 release candidate (backport-2.11.8 + #7415) pfeerick/edgetx#27, which passed CI.
• chore: bump version (2.11.7 → 2.11.8)

Not included

• fix(color): modifying model labels may corrupt model yaml files #7709 fix(color): modifying model labels may corrupt model yaml files. It fixes a regression from feat(color): use dynamic memory allocation for screen & widget data #6782 (global screen and widget data, 2.12.0+). On 2.11 that data still lives in ModelData, so the bug doesn't exist here. It's labelled backport/2.12 only.

Behaviour changes worth noting for an LTS point release

All are intended upstream:

• chore(elrs): allow future use of unused bits in the "Arming status byte" #7022: the CRSF RC channels frame is now always a 25-byte payload (previously 24 in CH5 arming mode). Per the PR discussion, ELRS V3 ignores the extra byte and V4 reads bits 0/1, and the CRSF spec says receivers must ignore extra fields.
• fix(lua): compare float with int strictly in equality #7611: in Lua, float/integer equality is now strict (0.5 == 0 is false), matching Lua 5.3.
• fix(color): UI issues adding and removing labels #7715: a newly added label is no longer auto-selected as the filter.
• fix(firmware): audio logic does not use all of the available buffers #7689: replaces 2.11's existing audio buffer FIFO fix (fix(sound): sound playing sometimes sluggish #7472/fix(cpn): audio does not play in the simulator #7685) with the implementation used on 2.12/main.
• fix(stm32f4): Hangs during flashing firmware #7415: the bootloader and the radio's firmware updater now report a flash write failure instead of always showing success, and each written page is verified.
• Add compile time option for xlite alt layout #2662: new XLITE_ALT_LAYOUT build option for X-Lite / X-Lite S (default OFF, so default builds are unchanged). When enabled, it swaps the key and left-trim GPIO assignments.

Outstanding Items

• Sweep for backport/2.11-labelled PRs milestoned 2.11.8 not yet covered
• CI green (gtests-radio, including the new Lua and crossfire tests from fix(lua): compare float with int strictly in equality #7611/chore(elrs): allow future use of unused bits in the "Arming status byte" #7022, plus the Companion/simulator builds; these weren't built locally)
• Simulator audio sanity check (fix(firmware): audio logic does not use all of the available buffers #7689 touches the FIFO the simulator's audio callback reads from)

Build-verified locally: tx16s, x12s (VS1053 SPI audio), x9d (CLI=YES, covers the #6543 volume command) and x7 firmware build cleanly with no new warnings. xlite with XLITE_ALT_LAYOUT=ON builds, and its generated key table uses the alternative pins (4 trims, as in the stock layout). tx16s rebuilt with #7809. cli.cpp syntax-checks with DEBUG_AUDIO. Every commit was reviewed against its source PR by two independent review passes.

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