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tft_task_handler held spiLock for the entire LVGL cycle. Most of that cycle is timer work and rendering into the draw buffer, which issues no SPI at all - but on boards where the TFT, SD card and LoRa radio share one bus (T-Deck), every radio operation on the main loop still waited it out. That is tens to hundreds of milliseconds whenever the UI animates, felt as mesh RX/TX latency. device-ui now takes the lock around its own transfers instead (meshtastic/device-ui#356), so the coarse hold here can go and the bus is contended only during real traffic. Lend it spiLock through a reentrant adapter. device-ui nests its guards - SdFsCard::usedBytes() calls cardSize() and freeBytes(), each of which takes the lock - while spiLock is a plain binary semaphore that would self-deadlock on the second take, so track the owning task and only touch the underlying lock on the outermost acquire. Requires the device-ui pin bump included here. Tested on T-Deck: flush, touch, panel init, SD detect, powersave sleep and wake all exercised; LoRa RX decoding under a live UI, no deadlocks, no watchdog resets. Also builds seeed-sensecap-indicator-tft. Co-authored-by: Manuel <71137295+mverch67@users.noreply.github.com>