docs: update dashboard MVP status and roadmap

docs/project-state.md

@@ -283,3 +283,35 @@ Current 2-channel testing should continue until the LilyGO board arrives and is
 The Waveshare ESP32-S3 Touch LCD 5B is expected next.
 
 Next dashboard work should follow `docs/waveshare-5b-bringup-checklist.md` and start with standalone display/touch validation before any Cargo ESP or vehicle integration.
+
+## Dashboard MVP Status
+
+Current dashboard hardware:
+
+- Waveshare ESP32-S3 Touch LCD 5B
+- WiFi client to Cargo ESP32 AP
+- HTTP API consumer
+
+Current dashboard communication path:
+
+    Dashboard ESP32-S3
+        -> WiFi
+        -> HTTP
+        -> Cargo ESP32
+        -> /api/v1
+
+Current dashboard features:
+
+- Boot screen
+- Dashboard version display
+- Battery SOC gauge
+- Charge/discharge current display
+- Runtime estimation
+- Time-to-full estimation
+- Idle battery state
+- Relay controls
+- Dynamic relay button sizing
+- State-colored relay buttons
+- WiFi signal indicator
+- Cargo ESP connectivity indicator
+- Fast status polling using field-filtered API requests