fix(picker): prefer RAK4631 UART2 for new installations

docs/_javascript/firmware_picker.js

@@ -614,14 +614,12 @@
       const sensorSuffix = (target.match(/-(?:full|reduced)$/) || [""])[0];
       const baseTarget = sensorSuffix ? target.slice(0, -sensorSuffix.length) : target;
       const rs232Replacement = mergedRs232Targets[baseTarget];
-      // Qualified RAK Full/Reduced images retain powered WisBlock GPS and
-      // reserve UART1 even when its bounded probe saw no receiver. The exact
-      // GPS-free Serial1 image remains a distinct, usable hardware choice.
-      const reservedRakUart1 = sensorSuffix &&
-        /^rak_4631_repeater_bridge_rs232_serial1(?:_lora_ota_no_external_sensors)?$/.test(baseTarget);
+      // Recommendations prefer the combined UART2 image on RAK4631. Exact
+      // Serial1 files remain in raw rows for existing GPS-free installations;
+      // this preference does not migrate their wiring or OTA identity.
       // Preserve the exact sensor policy: a Full image does not replace a
       // missing Reduced image, or an older unsuffixed compatibility image.
-      const replacedRs232 = Boolean(!reservedRakUart1 && rs232Replacement &&
+      const replacedRs232 = Boolean(rs232Replacement &&
         [].concat(rs232Replacement).some(function (replacement) {
           return targets.has(replacement + sensorSuffix);
         }));
@@ -1682,7 +1680,7 @@
     if (info.rs232 && infrastructure) {
       const mode = chosen.mode;
       const uartNote = /^RAK_4631_repeater_unified_lora_ota-(?:full|reduced)$/i.test(profile.target) && profile.sensorProfile
-        ? "Unified RAK4631 uses UART2 for the RS-232 bridge; select it with set bridge.uart 2 while the bridge is stopped. GPS safety guards reserve UART1 even when no GPS was detected. Use the separate GPS-free Serial1 image for UART1, with no powered UART GPS or header-connected W25 flash on those pins."
+        ? "Unified RAK4631 uses UART2 for the RS-232 bridge; select it with set bridge.uart 2 while the bridge is stopped. GPS safety guards reserve UART1 even when no GPS was detected. Use UART2 for new installations. Legacy Serial1 downloads remain available by exact filename for existing GPS-free wiring."
         : /^RAK_4631_repeater_bridge_rs232_serial1(?:_lora_ota_no_external_sensors)?-(?:full|reduced)$/i.test(profile.target)
           ? "This GPS-free Serial1 image uses UART1. Do not fit a powered UART GPS or header-connected W25 flash on the same UART1 pins. Use the unified UART2 image when those pins are occupied."
         : "Use the UART and pin map for this exact board. Canonical GPS-enabled RAK4631 uses UART2; select it with set bridge.uart 2 while the bridge is stopped. UART1 needs a compatible GPS-free image.";