feat: restore bench section UI with controls, PID RPM ramp, flowmeter charts, and fix CAN IDs

Restore the full bench control panel from the old source with MVVM architecture:

- Two-column left panel layout: bench info displays (RPM with target/voltage,
  temps, pressures, Q-flow, pump live values) and user commands (direction
  toggle, start/stop with RPM popup and quick-select buttons, oil pump toggle,
  turn downcounter with CAN send)
- PID RPM ramp controller (BenchPidController) with bumpless startup,
  anti-windup, and derivative-on-measurement for smooth motor speed transitions
- Real-time flowmeter charts (LiveChartsCore) for Q-Delivery and Q-Over
  with tolerance band overlays
- Bench/pump CAN liveness detection in PcanAdapter (receive-only IDs)
- K-Line connection status indicator (placeholder)
- Periodic relay bitmask sender (~21ms) and ElectronicMsg keepalive start
  on CAN connect, pump sender starts immediately on pump load

Fix critical CAN message ID bug: default bench XML values were incorrectly
converted from old source (decimal-notation hex parsed as actual hex digits,
e.g. "10" -> "A" instead of keeping "10" which parses as 0x10). Corrected
all IDs to match hardware: 0x10, 0x11, 0x13, 0x14, 0x15, 0x50, 0x51, 0x55.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

Services/ICanService.cs

@@ -21,6 +21,18 @@ namespace HC_APTBS.Services
         /// </summary>
         event Action<string, bool>? StatusChanged;
 
+        /// <summary>
+        /// Raised when the bench controller starts or stops sending CAN frames.
+        /// <c>alive</c> is true when frames are being received, false after a timeout.
+        /// </summary>
+        event Action<bool>? BenchLivenessChanged;
+
+        /// <summary>
+        /// Raised when the pump ECU starts or stops sending CAN frames.
+        /// <c>alive</c> is true when frames are being received, false after a timeout.
+        /// </summary>
+        event Action<bool>? PumpLivenessChanged;
+
         // ── Properties ────────────────────────────────────────────────────────────
 
         /// <summary>Most recent PCAN status code.</summary>
@@ -59,6 +71,18 @@ namespace HC_APTBS.Services
         /// <summary>Removes entries whose keys match the supplied dictionary.</summary>
         void RemoveParameters(Dictionary<uint, List<CanBusParameter>> parameters);
 
+        /// <summary>
+        /// Registers CAN message IDs that belong to the bench controller.
+        /// Frames with these IDs drive <see cref="BenchLivenessChanged"/>.
+        /// </summary>
+        void RegisterBenchMessageIds(IReadOnlyCollection<uint> ids);
+
+        /// <summary>
+        /// Registers CAN message IDs that belong to the pump ECU.
+        /// Frames with these IDs drive <see cref="PumpLivenessChanged"/>.
+        /// </summary>
+        void RegisterPumpMessageIds(IReadOnlyCollection<uint> ids);
+
         // ── Transmit ──────────────────────────────────────────────────────────────
 
         /// <summary>