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/toolsets/ToolsetsScreen.kt

@@ -1,5 +1,6 @@
 package com.m57.hermescontrol.ui.toolsets
 
+import androidx.compose.foundation.clickable
 import androidx.compose.foundation.layout.Arrangement
 import androidx.compose.foundation.layout.Box
 import androidx.compose.foundation.layout.Column
@@ -38,6 +39,8 @@ import androidx.compose.ui.unit.dp
 import androidx.lifecycle.compose.collectAsStateWithLifecycle
 import androidx.lifecycle.viewmodel.compose.viewModel
 import com.m57.hermescontrol.R
+import com.m57.hermescontrol.data.model.Toolset
+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
@@ -47,6 +50,7 @@ import com.m57.hermescontrol.ui.common.SearchBar
 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
 
 @OptIn(ExperimentalMaterial3Api::class)
 @Composable
@@ -58,6 +62,7 @@ fun ToolsetsScreen(
     val state by viewModel.uiState.collectAsStateWithLifecycle()
 
     var query by remember { mutableStateOf("") }
+    var showDetail by remember { mutableStateOf<Toolset?>(null) }
 
     val filteredToolsets =
         remember(query, state.toolsets) {
@@ -136,7 +141,7 @@ fun ToolsetsScreen(
                             }
                             items(filteredToolsets, key = { it.name }) { toolset ->
                                 Card(
-                                    modifier = Modifier.fillMaxWidth(),
+                                    modifier = Modifier.fillMaxWidth().clickable(onClick = { showDetail = toolset }),
                                     colors =
                                         CardDefaults.cardColors(
                                             containerColor =
@@ -208,5 +213,13 @@ fun ToolsetsScreen(
                 }
             }
         }
+
+        showDetail?.let { toolset ->
+            DetailDialog(
+                title = toolset.label ?: toolset.name,
+                rows = toolset.toDetailRows(),
+                onDismiss = { showDetail = null },
+            )
+        }
     }
 }