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

tests/Core.Tests/MeterMetaTests.cs

@@ -46,4 +46,16 @@ public sealed class MeterMetaTests
 
         Assert.Equal(MeterRoles.GridImport, MeterMeta.Role(updated));
     }
+
+    [Theory]
+    [InlineData(null)]
+    [InlineData("")]
+    [InlineData("   ")]
+    public void SetRole_removes_role_when_blank_and_keeps_other_keys(string? role)
+    {
+        var updated = MeterMeta.SetRole("{\"role\":\"grid_import\",\"expression\":\"a-b\"}", role);
+
+        Assert.Null(MeterMeta.Role(updated));
+        Assert.Equal("a-b", MeterMeta.ReadString(updated, "expression"));
+    }
 }

tests/Integration.Tests/DashboardRenderTests.cs

@@ -89,7 +89,8 @@ public sealed class DashboardRenderTests(TimescaleFixture fx)
             foreach (var path in new[]
             {
                 "/meters", "/trends", "/solar", "/consumables", "/import",
-                "/admin/tariffs", "/admin/energy-types", $"/meters/{hausId}",
+                "/admin/tariffs", "/admin/energy-types", "/admin/categories",
+                "/admin/connectors", "/admin/settings", $"/meters/{hausId}",
             })
             {
                 var response = await client.GetAsync(new Uri(path, UriKind.Relative));

tests/Integration.Tests/Ingestion/HaConnectionTesterTests.cs

@@ -0,0 +1,49 @@
+using MeterVault.Infrastructure.Ingestion;
+using Microsoft.Extensions.Logging.Abstractions;
+
+namespace MeterVault.Integration.Tests.Ingestion;
+
+/// <summary>
+/// The HA connection tester must fail closed on missing config <em>before</em> any network call —
+/// so a misconfigured connector gives a clear message, never an exception. The stub factory throws
+/// if the tester ever tries to create an HttpClient, proving these branches never reach the network.
+/// </summary>
+public sealed class HaConnectionTesterTests
+{
+    [Fact]
+    public async Task Missing_base_url_fails_without_network()
+    {
+        var result = await NewTester().TestAsync(baseUrl: "", tokenEnv: "SOME_TOKEN", entityId: null);
+
+        Assert.False(result.Ok);
+        Assert.Contains("Base URL", result.Message, StringComparison.OrdinalIgnoreCase);
+    }
+
+    [Fact]
+    public async Task Missing_token_env_fails_without_network()
+    {
+        var result = await NewTester().TestAsync(baseUrl: "http://ha.local:8123", tokenEnv: "", entityId: null);
+
+        Assert.False(result.Ok);
+        Assert.Contains("env-var", result.Message, StringComparison.OrdinalIgnoreCase);
+    }
+
+    [Fact]
+    public async Task Unset_token_env_var_fails_without_network()
+    {
+        var result = await NewTester().TestAsync(
+            baseUrl: "http://ha.local:8123", tokenEnv: "METERVAULT_DEFINITELY_UNSET_TOKEN_VAR", entityId: null);
+
+        Assert.False(result.Ok);
+        Assert.Contains("is not set", result.Message, StringComparison.OrdinalIgnoreCase);
+    }
+
+    private static HaConnectionTester NewTester() =>
+        new(new ThrowingHttpClientFactory(), NullLogger<HaConnectionTester>.Instance);
+
+    private sealed class ThrowingHttpClientFactory : IHttpClientFactory
+    {
+        public HttpClient CreateClient(string name) =>
+            throw new InvalidOperationException("Network must not be touched for a config-guard failure.");
+    }
+}