feat(ui-lvgl): Diagnostics > Noise tab for RF noise hunting

The LoRa noise floor with the board's parts off one at a time, sweeps of
850-930 MHz, the mesh channel and a 7.8 kHz zoom on its loudest point; a
slow cycle of the same states for a second radio beside the device; and
a spike hunt over 864-876 MHz listing the lines over the floor and their
spacing (how the I2S MCLK comb was found).

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

variants/wio-tracker-l2/WioTrackerL2Board.h

@@ -68,6 +68,8 @@ public:
       expWritePin(EXP_PIN_GNSS_EN, LOW);
     }
   }
+  // microSD rail (unmount first)
+  void setSdPower(bool on) { expWritePin(EXP_PIN_TF_EN, on); }
   // Grove expansion port rail (nothing on-board depends on it)
   void setGrovePower(bool on) { expWritePin(EXP_PIN_GROVE_EN, on); }