fix(ci): 质量检查 - 修复预演台重构后 Web 与后端检查失败

补回预演台模式切换、模式门控时间轴与非模态引导挂载，取景切换器使用激活态 token，模板场景补齐 environment 字段；E2E 改为验证新版 FloatingDock 与模式切换下的时间轴，工作流改用重命名后的 test:previs:e2e；修正 canvas_share.go 的 gofmt 格式，并按新布局与欢迎页外观行为校准合同测试。

web/test/helpers/module-group-source.ts

@@ -22,6 +22,7 @@ export const SPLIT_MODULE_GROUPS: Record<string, readonly string[]> = {
     "pages/admin/settings/appearance-settings-page.tsx": ["pages/admin/settings/appearance-settings-parts.tsx"],
     "pages/admin/settings/storage-settings-page.tsx": ["pages/admin/settings/storage-settings-model.ts"],
     "pages/assets/index.tsx": ["pages/assets/asset-library-cards.tsx", "pages/assets/asset-library-format.ts", "pages/assets/asset-library-panels.tsx"],
+    "components/canvas/previs/canvas-previs-workbench.tsx": ["components/canvas/previs/previs-inspectors.tsx"],
     "pages/canvas/project.tsx": ["pages/canvas/canvas-clipboard.ts"],
     "pages/create/creation-workspace.tsx": ["pages/create/creation-workspace-empty.tsx", "pages/create/creation-workspace-history.tsx", "pages/create/creation-workspace-messages.tsx"],
     "services/user-data-sync.ts": ["services/user-data-sync-media.ts"],