feat(#534): add OAuth provider management screen + credential_warning surfacing (#566)

* feat(#534): add OAuth provider management screen + credential_warning surfacing

* style(#534): fix ktlint import-ordering in ProvidersViewModel

* fix(#534): address agy review — terminal DONE/ERROR dialog states + PKCE browser launch

* fix(#534): add Done/Close dialog strings

* fix(#534): address agy review - terminal DONE/ERROR dialog states, real PKCE browser launch, clear flow state

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Co-authored-by: M57 <m57@hermes-control.app>

app/src/main/java/com/m57/hermescontrol/ScreenRegistry.kt

@@ -8,6 +8,7 @@ import androidx.compose.material.icons.filled.AccountCircle
 import androidx.compose.material.icons.filled.BarChart
 import androidx.compose.material.icons.filled.Bolt
 import androidx.compose.material.icons.filled.Build
+import androidx.compose.material.icons.filled.Cloud
 import androidx.compose.material.icons.filled.Code
 import androidx.compose.material.icons.filled.Dashboard
 import androidx.compose.material.icons.filled.Devices
@@ -40,6 +41,7 @@ import com.m57.hermescontrol.ui.pairing.PairingScreen as PairingScreenContent
 import com.m57.hermescontrol.ui.plugins.PluginsScreen as PluginsScreenContent
 import com.m57.hermescontrol.ui.process.ProcessesScreen as ProcessesScreenContent
 import com.m57.hermescontrol.ui.profiles.ProfilesScreen as ProfilesScreenContent
+import com.m57.hermescontrol.ui.providers.ProvidersScreen as ProvidersScreenContent
 import com.m57.hermescontrol.ui.sessions.SessionsScreen as HistoryScreenContent
 import com.m57.hermescontrol.ui.settings.SettingsScreen as SettingsScreenContent
 import com.m57.hermescontrol.ui.skills.SkillsScreen as SkillsScreenContent
@@ -157,6 +159,12 @@ object ScreenRegistry {
                 Icons.AutoMirrored.Filled.ListAlt,
                 DrawerSection.CONFIGURE,
             ) { sessionId, openDrawer -> ChannelsScreenContent(onOpenDrawer = openDrawer) },
+            ScreenDefinition(
+                ProvidersScreen,
+                R.string.screen_providers,
+                Icons.Filled.Cloud,
+                DrawerSection.CONFIGURE,
+            ) { sessionId, openDrawer -> ProvidersScreenContent(onOpenDrawer = openDrawer) },
             ScreenDefinition(
                 SystemScreen,
                 R.string.screen_system,