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/system/SystemViewModel.kt

@@ -700,23 +700,4 @@ class SystemViewModel :
     override fun clearToast() {
         _uiState.update { it.copy(toastMessage = null) }
     }
-
-    fun clearTransientState() {
-        actionPollingJob?.cancel()
-        _uiState.update {
-            it.copy(
-                errorMessage = null,
-                toastMessage = null,
-                activeAction = null,
-                actionLog = null,
-                isLoading = false,
-                addingCred = false,
-                creatingHook = false,
-                sharing = false,
-                checkingUpdate = false,
-                updateConfirmOpen = false,
-                hookModalOpen = false,
-            )
-        }
-    }
 }