Admin write-CRUD, Home Assistant connector config, wiring audit

Three requested phases.

1) Admin section (SDD §8.7) — MudBlazor inline-dialog CRUD, consistent pattern,
   delete guards, snackbar feedback, shared Confirm helper:
   - Energy types: create/edit/delete (blocks delete when meters reference it).
   - Meters: create/edit/delete; recomputes consumption when mode/baseline
     changes (NormalizationService over a fresh factory context, in a tx);
     delete cascades data (consumption+readings are Restrict → removed first).
   - A meter's ingest sources: manage on the meter-detail Sources tab
     (add/edit/delete MQTT/Tasmota/HA sources with typed config).
   - Tariffs: full CRUD (scope/component/value/validity).
   - Cost categories: CRUD + member management (meter or energy-type members).
   - Connectors: ingestion_endpoint CRUD (MQTT broker + Home Assistant);
     secrets referenced by env-var name only, never stored.
   - Settings: read-only effective-config view (settings are env-driven and
     reproducible, so an editable form would change nothing — kept honest).
   PV role is now editable on meters (MeterMeta.SetRole can clear a role).

2) Read Home Assistant — extracted a shared public HaEndpointConfig (was a
   private record in the worker), added HaConnectionTester (powers the connector
   "Test connection": checks base URL + env-resolved token, optionally reads one
   entity). Configuring an HA connector + an HA source on a meter drives the
   existing REST-poll worker end to end. (WebSocket push stays a future
   optimization; REST poll already reads HA.)

3) Wiring/placeholder audit — swept every OnClick/Href: all handlers are real,
   all internal links resolve to real routes, no TODO/stub/placeholder code.
   Fixed one genuine gap: MainLayout had no drawer toggle, so the nav was
   unreachable on narrow screens — added a hamburger button.

Tests: +6 (MeterMeta.SetRole role-removal; HaConnectionTester fail-closed
guard branches with a throwing HttpClientFactory proving no network on bad
config); render test now covers all admin routes. 69 Core + 45 Integration =
114 green. Live-verified in Docker: all admin pages 200, drawer toggle present,
Settings shows real effective config.

Claude-Session: https://claude.ai/code/session_01Lz2RqAsnQhetqWNoCDfexK

src/Infrastructure/Ingestion/HaConnectionTester.cs

@@ -0,0 +1,67 @@
+using System.Net.Http.Headers;
+using Microsoft.Extensions.Logging;
+
+namespace MeterVault.Infrastructure.Ingestion;
+
+/// <summary>Outcome of a Home Assistant connectivity test.</summary>
+public sealed record HaTestResult(bool Ok, string Message, double? SampleValue = null);
+
+/// <summary>
+/// Verifies a Home Assistant connection from the admin UI: checks the base URL + resolved token
+/// against <c>GET /api/</c>, and optionally reads one entity's state. Confirms the app can actually
+/// read HA before a source is relied upon (SDD §6.2). Token is resolved by reference (env var).
+/// </summary>
+public sealed class HaConnectionTester(IHttpClientFactory httpClientFactory, ILogger<HaConnectionTester> logger)
+{
+    private readonly IHttpClientFactory _httpClientFactory = httpClientFactory;
+    private readonly ILogger<HaConnectionTester> _logger = logger;
+
+    public async Task<HaTestResult> TestAsync(
+        string? baseUrl, string? tokenEnv, string? entityId, CancellationToken cancellationToken = default)
+    {
+        if (string.IsNullOrWhiteSpace(baseUrl))
+        {
+            return new HaTestResult(false, "Base URL is required.");
+        }
+
+        if (string.IsNullOrWhiteSpace(tokenEnv))
+        {
+            return new HaTestResult(false, "Token env-var name is required (the token is resolved from it at runtime).");
+        }
+
+        var token = Environment.GetEnvironmentVariable(tokenEnv);
+        if (string.IsNullOrWhiteSpace(token))
+        {
+            return new HaTestResult(false, $"Environment variable '{tokenEnv}' is not set on the server.");
+        }
+
+        var client = _httpClientFactory.CreateClient();
+        client.Timeout = TimeSpan.FromSeconds(10);
+
+        try
+        {
+            using var request = new HttpRequestMessage(HttpMethod.Get, $"{baseUrl.TrimEnd('/')}/api/");
+            request.Headers.Authorization = new AuthenticationHeaderValue("Bearer", token);
+            using var response = await client.SendAsync(request, cancellationToken).ConfigureAwait(false);
+            if (!response.IsSuccessStatusCode)
+            {
+                return new HaTestResult(false, $"HA returned {(int)response.StatusCode} {response.ReasonPhrase}.");
+            }
+
+            if (string.IsNullOrWhiteSpace(entityId))
+            {
+                return new HaTestResult(true, "Connected — Home Assistant API reachable and token accepted.");
+            }
+
+            var state = await new HaStateClient(client).GetStateAsync(baseUrl, token, entityId, null, cancellationToken).ConfigureAwait(false);
+            return state is { } value
+                ? new HaTestResult(true, $"Connected — {entityId} = {value.Value}.", value.Value)
+                : new HaTestResult(false, $"Connected, but '{entityId}' has no numeric state (unavailable/unknown or non-numeric).");
+        }
+        catch (Exception ex)
+        {
+            _logger.LogWarning(ex, "Home Assistant connection test failed for {BaseUrl}", baseUrl);
+            return new HaTestResult(false, $"Connection failed: {ex.Message}");
+        }
+    }
+}