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/drivers/si4684/include/si4684/Si4684Driver.hpp

@@ -21,6 +21,7 @@
 
 #include <cstdint>
 #include <expected>
+#include <optional>
 #include <span>
 #include <vector>
 
@@ -236,6 +237,21 @@ public:
      */
     [[nodiscard]] std::expected<Si4684FmRdsStatus, Si4684Error> readFmRds();
 
+    /**
+     * @brief    readDabServiceData — read one queued DAB data-service block.
+     *
+     * @dname    readDabServiceData
+     * @param    statusOnly  Poll queue depth without consuming payload.
+     * @param    ack         Acknowledge DSRVINT when reading payload.
+     * @return   Data block on success, nullopt when queue empty, or Si4684Error.
+     * @pubstate reads GET_DIGITAL_SERVICE_DATA response bytes.
+     *
+     * @author   Michele Bigi
+     * @date     2026-07-06
+     */
+    [[nodiscard]] std::expected<std::optional<Si4684DabServiceData>, Si4684Error>
+    readDabServiceData(bool statusOnly, bool ack);
+
     /**
      * @brief    installDefaultDabFrequencyPlan — load Band III frequency list.
      *

Software/components/drivers/si4684/include/si4684/Si4684Tuner.hpp

@@ -12,10 +12,14 @@
  */
 #pragma once
 
+#include "core/DabDynamicLabelAccumulator.hpp"
 #include "core/FrequencyKHz.hpp"
 #include "core/ITuner.hpp"
+#include "core/RdsMetadataAccumulator.hpp"
 #include "si4684/Si4684Driver.hpp"
 
+#include <optional>
+
 namespace si4684 {
 
 /**
@@ -190,6 +194,10 @@ private:
     std::uint8_t dabIndex_;
     core::FrequencyKHz fmFrequency_;
     std::uint8_t volume_;
+    core::RdsMetadataAccumulator rdsMetadata_;
+    core::DabDynamicLabelAccumulator dabDynamicLabel_;
+    std::optional<std::uint32_t> lastDabServiceId_;
+    std::optional<std::uint32_t> lastDabComponentId_;
 };
 
 } // namespace si4684

Software/components/drivers/si4684/include/si4684/Si4684Types.hpp

@@ -18,6 +18,7 @@
 #include <array>
 #include <cstddef>
 #include <cstdint>
+#include <vector>
 
 namespace si4684 {
 
@@ -113,6 +114,27 @@ struct Si4684FmRdsStatus {
     std::uint16_t blockC; ///< RDS block C.
     std::uint16_t blockD; ///< RDS block D.
     bool received;        ///< Group received flag.
+    std::uint8_t fifoUsed; ///< Remaining groups in the RDS FIFO.
+};
+
+/**
+ * @brief    Si4684DabServiceData — one GET_DIGITAL_SERVICE_DATA block.
+ *
+ * @dname    Si4684DabServiceData
+ * @return   n/a (type)
+ * @pubstate Plain DTO from GET_DIGITAL_SERVICE_DATA response bytes.
+ *
+ * @author   Michele Bigi
+ * @date     2026-07-06
+ */
+struct Si4684DabServiceData {
+    std::uint32_t serviceId;    ///< Associated DAB service identifier.
+    std::uint32_t componentId;  ///< Associated component identifier.
+    std::uint8_t dataSrc;       ///< Payload source (2 = DLS PAD).
+    std::uint16_t byteCount;    ///< Payload byte count.
+    std::uint16_t segmentIndex; ///< Zero-based segment index.
+    std::uint16_t segmentCount; ///< Total segments for this label object.
+    std::vector<std::uint8_t> payload; ///< Raw payload bytes.
 };
 
 /**