fix(version): splash screen showed 1.17, not the actual 1.17.1 upstream base

release-notes.md's v1.25 section already documents "Updated upstream
base to companion-v1.17.1", and that merge (68527e7b) is confirmed in
main's history -- but every MESHCORE_VERSION string, including
UITask.cpp's fallback default for boards that don't set it explicitly
(Heltec v3/v4, ThinkNode, Mesh Pocket, T-Echo), was still hardcoded to
the pre-bump "1.17". Bumped every occurrence to "1.17.1" to match what
actually shipped.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>

variants/lilygo_techo_lite/platformio.ini

@@ -92,7 +92,7 @@ build_flags =
   ; -D MESH_DEBUG=1
   -D AUTO_SHUTDOWN_MILLIVOLTS=3300
   -D FIRMWARE_SOLO_BUILD=1
-  -D MESHCORE_VERSION='"1.17"'
+  -D MESHCORE_VERSION='"1.17.1"'
 build_src_filter = ${LilyGo_T-Echo-Lite.build_src_filter}
   +<helpers/nrf52/SerialBLEInterface.cpp>
   +<../examples/companion_radio/*.cpp>

variants/wio-tracker-l1-eink/platformio.ini

@@ -35,7 +35,7 @@ build_flags = ${nrf52_base.build_flags}
   -D PIN_BUZZER=12
   -D QSPIFLASH=1
   -D FIRMWARE_SOLO_BUILD=1
-  -D MESHCORE_VERSION='"1.17"'
+  -D MESHCORE_VERSION='"1.17.1"'
   -D UI_SENSORS_PAGE=1
   -D BLE_PIN_CODE=123456
 build_src_filter = ${nrf52_base.build_src_filter}

variants/wio-tracker-l1/platformio.ini

@@ -70,7 +70,7 @@ build_flags = ${WioTrackerL1.build_flags}
   -D PIN_BUZZER=12
   -D QSPIFLASH=1
   -D FIRMWARE_SOLO_BUILD=1
-  -D MESHCORE_VERSION='"1.17"'
+  -D MESHCORE_VERSION='"1.17.1"'
   -D UI_SENSORS_PAGE=1
 ; NOTE: DO NOT ENABLE -->  -D MESH_PACKET_LOGGING=1
 ; NOTE: DO NOT ENABLE -->  -D MESH_DEBUG=1
@@ -112,7 +112,7 @@ build_flags = ${WioTrackerL1.build_flags}
   -D QSPIFLASH=1
   -D ADVERT_NAME='"@@MAC"'
   -D FIRMWARE_SOLO_BUILD=1
-  -D MESHCORE_VERSION='"1.17"'
+  -D MESHCORE_VERSION='"1.17.1"'
   -D UI_SENSORS_PAGE=1
   -D ENV_PIN_SDA=PIN_WIRE1_SDA
   -D ENV_PIN_SCL=PIN_WIRE1_SCL