Add preset polish and broadcast metadata (fw 0.8.0).

Ship station reorder, DAB playing ids in presets, RDS PS/RT and DAB DLS in tuner status, Si4684 data-service read, host tests, and UI now-playing lines.

Co-authored-by: Cursor <cursoragent@cursor.com>

Software/components/services/tuner/include/tuner/TunerService.hpp

@@ -20,6 +20,7 @@
 
 #include <cstdint>
 #include <expected>
+#include <optional>
 #include <vector>
 
 namespace tuner {
@@ -72,7 +73,7 @@ public:
      * @dname    tuneDab
      * @param    freqIndex  Ensemble index 0–37.
      * @return   Ok on success, or a TunerError from ITuner.
-     * @pubstate writes lastDabIndex_ on success.
+     * @pubstate writes lastDabIndex_ on success; clears last-played DAB ids.
      *
      * @author   Michele Bigi
      * @date     2026-07-06
@@ -129,7 +130,7 @@ public:
      * @param    serviceId    Selected service identifier.
      * @param    componentId  Audio component within the service.
      * @return   Ok on success, or a TunerError from ITuner.
-     * @pubstate delegates to tuner_.
+     * @pubstate delegates to tuner_; caches service/component for status JSON.
      *
      * @author   Michele Bigi
      * @date     2026-07-06
@@ -168,6 +169,8 @@ private:
     std::uint8_t lastDabIndex_;
     core::FrequencyKHz lastFmFrequency_;
     std::uint8_t volume_;
+    std::optional<std::uint32_t> lastPlayedServiceId_;
+    std::optional<std::uint32_t> lastPlayedComponentId_;
 };
 
 } // namespace tuner

Software/components/services/tuner/src/TunerService.cpp

@@ -37,6 +37,10 @@ std::expected<core::TunerStatus, core::TunerError> TunerService::refreshStatus()
     auto status = tuner_.readStatus();
     if (status) {
         volume_ = status->volume;
+        if (status->band == core::TunerBand::Dab) {
+            status->dabPlayingServiceId = lastPlayedServiceId_;
+            status->dabPlayingComponentId = lastPlayedComponentId_;
+        }
     }
     return status;
 }
@@ -48,6 +52,8 @@ std::expected<void, core::TunerError> TunerService::tuneDab(
         return result;
     }
     lastDabIndex_ = freqIndex;
+    lastPlayedServiceId_.reset();
+    lastPlayedComponentId_.reset();
     return {};
 }
 
@@ -81,7 +87,12 @@ std::expected<void, core::TunerError> TunerService::playDabService(
     std::uint32_t serviceId,
     std::uint32_t componentId)
 {
-    return tuner_.playDabService(serviceId, componentId);
+    if (auto result = tuner_.playDabService(serviceId, componentId); !result) {
+        return result;
+    }
+    lastPlayedServiceId_ = serviceId;
+    lastPlayedComponentId_ = componentId;
+    return {};
 }
 
 std::expected<void, core::TunerError> TunerService::setVolume(std::uint8_t level)