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/skills/SkillsViewModel.kt

@@ -205,17 +205,6 @@ class SkillsViewModel(
         }
     }
 
-    fun clearHubPreview() {
-        _uiState.update {
-            it.copy(
-                hubPreviewIdentifier = null,
-                hubPreviewContent = null,
-                isHubPreviewing = false,
-                hubPreviewError = null,
-            )
-        }
-    }
-
     // ── Hub install ─────────────────────────────────────────────────────────
 
     fun installSkill(identifier: String) {
@@ -293,43 +282,6 @@ class SkillsViewModel(
         }
     }
 
-    // ── SKILL.md preview ────────────────────────────────────────────────────
-
-    fun previewSkill(skillName: String) {
-        _uiState.update {
-            it.copy(
-                previewSkillName = skillName,
-                previewSkillContent = null,
-                isLoadingPreview = true,
-            )
-        }
-        viewModelScope.launch {
-            val result =
-                withContext(Dispatchers.IO) {
-                    safeApiCall { ApiClient.hermesApi.getSkillContent(skillName) }
-                }
-            when (result) {
-                is NetworkResult.Success -> {
-                    _uiState.update {
-                        it.copy(
-                            isLoadingPreview = false,
-                            previewSkillContent = result.data.content,
-                        )
-                    }
-                }
-
-                is NetworkResult.Failure -> {
-                    _uiState.update {
-                        it.copy(
-                            isLoadingPreview = false,
-                            toastMessage = "Failed to load preview: ${result.error.message}",
-                        )
-                    }
-                }
-            }
-        }
-    }
-
     fun clearPreview() {
         _uiState.update {
             it.copy(