refactor: remove bottom navigation bar (#665 #666 #667 #668) (#672)

* refactor(nav): remove bottom NavigationBar from Scaffold (#665)

* refactor(theme): remove BottomNavDisplayMode enum (#666)

* refactor(settings): remove nav bar customization page (#667)

* chore: clean up unused imports after bottom nav removal (#668)

* chore: remove dead bottom nav infrastructure after removal

- Remove SettingsNavBar NavKey (NavigationKeys.kt)
- Remove bottomNavItems field from ServerStoreState + migration code
- Remove _bottomNavItemsFlow, getBottomNavItems, setBottomNavItems from AuthManager
- Remove bottomNavItems handling from selfHealed() (ServerCollectionOps)
- Remove redundant bottomBar={} from Scaffold (Navigation.kt)
- Remove unused nav bar strings from values/strings.xml + values-ko/strings.xml
- Remove content_desc_move_up/down/remove_item strings
- Update SettingsViewModelTest.kt (drop stale getBottomNavItems mock)
- Update ServerStoreTest.kt (remove bottomNavItems assertions)

---------

Co-authored-by: M57 <Hy4ri@users.noreply.github.com>

app/src/test/java/com/m57/hermescontrol/ui/settings/SettingsViewModelTest.kt

@@ -3,7 +3,6 @@ package com.m57.hermescontrol.ui.settings
 import com.m57.hermescontrol.data.config.ConnectionProfile
 import com.m57.hermescontrol.data.local.AuthManager
 import com.m57.hermescontrol.data.remote.ApiClient
-import com.m57.hermescontrol.theme.BottomNavDisplayMode
 import com.m57.hermescontrol.theme.ThemePreference
 import com.m57.hermescontrol.theme.ThemePreset
 import io.mockk.every
@@ -63,12 +62,10 @@ class SettingsViewModelTest {
         every { AuthManager.getThemePreference() } returns ThemePreference.SYSTEM
         every { AuthManager.isUseDynamicColors() } returns true
         every { AuthManager.getThemePreset() } returns ThemePreset.DEFAULT
-        every { AuthManager.getBottomNavItems() } returns emptyList()
         every { AuthManager.isTypingEffectEnabled() } returns true
         every { AuthManager.getTypingEffectDelayMs() } returns 30
         every { AuthManager.getConnectionProfiles() } returns emptyList()
         every { AuthManager.getSelectedProfileId() } answers { storedSelectedProfileId }
-        every { AuthManager.getBottomNavDisplayMode() } returns BottomNavDisplayMode.ICON_AND_TEXT
         every { AuthManager.baseUrl() } returns "http://127.0.0.1:9119/"
         every { AuthManager.setHost(any()) } returns Unit
         every { AuthManager.setPort(any()) } returns Unit
@@ -78,7 +75,6 @@ class SettingsViewModelTest {
         every { AuthManager.setThemePreference(any()) } returns Unit
         every { AuthManager.setUseDynamicColors(any()) } returns Unit
         every { AuthManager.setThemePreset(any()) } returns Unit
-        every { AuthManager.setBottomNavDisplayMode(any()) } returns Unit
         every { AuthManager.setTypingEffectEnabled(any()) } returns Unit
         every { AuthManager.setTypingEffectDelayMs(any()) } returns Unit
         every { AuthManager.setSelectedProfileId(any()) } answers {