refactor: remove verified dead code across data, UI, and resources (#680)

* refactor: remove unused dead code across data, UI, and resources

* fix: resolve dangling references left by dead-code removal

Restore empty object Motion (braces required) and remove the 12 stale
test usages that still called the now-deleted production symbols:
- ServerStoreTest: removeServer/switchToServer tests
- ServerEndpointTest: isCleartext assertions
- ConnectViewModelTest: onHostChange/onPortChange tests + 3 dropped R.string refs
- SettingsViewModelTest: renameProfile tests + clearNavigateToLogin
- E2eIntegrationTest: previewSkill tests + onHostChange/onPortChange calls

Verified locally: compileDebugUnitTestKotlin + 48 tests pass.

* fix: remove unused imports flagged by ktlint

Drops 4 no-longer-referenced imports left by the dead-code removal:
- HermesApiService: SkillScanResponse (scanHubSkill removed)
- ServerEndpointTest: assertFalse, assertTrue (isCleartext assertions dropped)
- SettingsViewModelTest: assertFalse (rename tests removed)

---------

Co-authored-by: M57 <hy4ri@users.noreply.github.com>

app/src/main/java/com/m57/hermescontrol/ui/chat/ChatBubble.kt

@@ -91,7 +91,6 @@ import com.m57.hermescontrol.theme.LocalHermesStatusColors
 import com.m57.hermescontrol.theme.SystemMessageColor
 import com.m57.hermescontrol.theme.ToolChipColor
 import com.m57.hermescontrol.theme.ToolChipColorLight
-import com.m57.hermescontrol.theme.UserBubble
 import com.m57.hermescontrol.theme.onColorFor
 import kotlinx.coroutines.delay
 import kotlinx.coroutines.launch

app/src/main/java/com/m57/hermescontrol/ui/chat/ChatViewModel.kt

@@ -1607,10 +1607,6 @@ class ChatViewModel(
 
     // ── UI actions ───────────────────────────────────────────────────────
 
-    fun toggleSessionPicker() {
-        _uiState.update { it.copy(showSessionPicker = !it.showSessionPicker) }
-    }
-
     /**
      * Dismiss the active clarify prompt and reject it (tell the agent no answer
      * was given).