feat(#500): tap-to-reveal detail dialog for truncated item descriptions (#501)

* feat(#500): tap-to-reveal detail dialog for truncated cards

Add shared DetailDialog composable and wire tap-to-open full metadata
dialogs across Skills (installed + hub), MCP servers, Plugins, Toolsets,
and Webhooks screens. Action buttons stay on the card (sticky); tapping
the card body reveals untruncated description + key metadata.

Refs: #500

* fix(#500): resolve compile errors from missing runtime imports + dialog scope

- add missing androidx.compose.runtime.mutableStateOf/remember imports
  in InstalledSkillsTab + HubSkillsTab (caused 'Unresolved reference'
  cascade on compileDebugKotlin)
- move PluginsScreen detail dialog inside the composable function scope
  (was nested in OrphanPluginCard -> showDetail unresolved)
- DetailDialog rows type: Pair<String?,String?> -> Pair<String,String?>
  (key always non-null; fixes type-inference failure)
- drop unnecessary safe call on non-null label

Verified locally with the Android SDK:
  ./gradlew :app:compileDebugKotlin  -> BUILD SUCCESSFUL
  ./gradlew :app:testDebugUnitTest   -> BUILD SUCCESSFUL

Refs: #500

* refactor(#500): extract toDetailRows() mappers + semantic status tones; wire SkillsScreen hub browse

- add DetailRows.kt with @Composable extension mappers for Skill/HubSkill/
  McpServer/PluginInfo/Toolset/WebhookSubscription -> List<DetailRow>
- DetailDialog now renders status rows via LocalHermesStatusColors (review #2):
  SUCCESS/NEUTRAL/WARNING/ERROR/INFO tones instead of plain onSurfaceVariant
- wire SkillsScreen.HubBrowseView/HubSkillCard tap -> DetailDialog (same UX as
  other screens) — user request
- remove JVM-signature-clashing Pair overload; drop unused Color import
- add detail_dialog_trust_level string (HubSkill has no version field)
- verified: compileDebugKotlin + testDebugUnitTest PASS locally w/ ANDROID_HOME

* fix(#500): full hub description in dialog + no name truncation

- HubBrowseView (both SkillsScreen + HubSkillsTab): on card tap, fetch
  previewHubSkill(identifier) to get the FULL SkillContentResponse.content
  (search snippet was truncated); dialog shows full content once loaded,
  with a spinner while previewing. Falls back to snippet if no identifier.
- SkillsViewModel: add hubPreviewContent/isHubPreviewing/hubPreviewError
  state + previewHubSkill()/clearHubPreview() (uses existing preview endpoint)
- DetailDialog: title now wraps fully (removed maxLines=2 ellipsis cap) so
  long skill names are never cut off
- verified: compileDebugKotlin PASS + ktlint clean (local ANDROID_HOME)

app/src/main/java/com/m57/hermescontrol/ui/mcp/McpServersScreen.kt

@@ -1,6 +1,7 @@
 package com.m57.hermescontrol.ui.mcp
 
 import androidx.compose.animation.AnimatedVisibility
+import androidx.compose.foundation.clickable
 import androidx.compose.foundation.layout.Arrangement
 import androidx.compose.foundation.layout.Box
 import androidx.compose.foundation.layout.Column
@@ -57,6 +58,7 @@ import com.m57.hermescontrol.R
 import com.m57.hermescontrol.data.model.McpCatalogEntry
 import com.m57.hermescontrol.data.model.McpServer
 import com.m57.hermescontrol.theme.LocalSpacing
+import com.m57.hermescontrol.ui.common.DetailDialog
 import com.m57.hermescontrol.ui.common.EmptyState
 import com.m57.hermescontrol.ui.common.ErrorState
 import com.m57.hermescontrol.ui.common.HermesScaffold
@@ -69,6 +71,7 @@ import com.m57.hermescontrol.ui.common.StatusBadgeType
 import com.m57.hermescontrol.ui.common.ToastEffect
 import com.m57.hermescontrol.ui.common.listContentPadding
 import com.m57.hermescontrol.ui.common.listItemSpacing
+import com.m57.hermescontrol.ui.common.toDetailRows
 
 @Composable
 fun McpServersScreen(
@@ -79,6 +82,7 @@ fun McpServersScreen(
     val state by viewModel.uiState.collectAsStateWithLifecycle()
     val spacing = LocalSpacing.current
     var query by remember { mutableStateOf("") }
+    var showDetail by remember { mutableStateOf<McpServer?>(null) }
 
     val filteredServers =
         remember(query, state.servers) {
@@ -162,7 +166,13 @@ fun McpServersScreen(
                     }
 
                     items(filteredServers, key = { "server:${it.name}" }) { server ->
-                        ServerCard(server = server, state = state, viewModel = viewModel, spacing = spacing)
+                        ServerCard(
+                            server = server,
+                            state = state,
+                            viewModel = viewModel,
+                            spacing = spacing,
+                            onClick = { showDetail = server },
+                        )
                     }
 
                     // ── 4. Catalog ──────────────────────────────────────
@@ -178,6 +188,14 @@ fun McpServersScreen(
             }
         }
     }
+
+    showDetail?.let { server ->
+        DetailDialog(
+            title = server.name,
+            rows = server.toDetailRows(),
+            onDismiss = { showDetail = null },
+        )
+    }
 }
 
 // ── Sections ──────────────────────────────────────────────────────
@@ -279,11 +297,12 @@ private fun ServerCard(
     state: McpServersUiState,
     viewModel: McpServersViewModel,
     spacing: com.m57.hermescontrol.theme.Spacing,
+    onClick: () -> Unit,
 ) {
     var showEnv by remember { mutableStateOf(false) }
 
     Card(
-        modifier = Modifier.fillMaxWidth(),
+        modifier = Modifier.fillMaxWidth().clickable(onClick = onClick),
         colors =
             CardDefaults.cardColors(
                 containerColor =