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## Summary Resolves six open issues by reorganizing node replacement components into a domain-driven folder structure, refactoring event handling to follow the emit pattern, and adding comprehensive test coverage across all affected modules. ## Changes - **What**: - Moved `SwapNodeGroupRow.vue` and `SwapNodesCard.vue` from `src/components/rightSidePanel/errors/` to `src/platform/nodeReplacement/components/` (Issues #9255) - Moved `useMissingNodeScan.ts` from `src/composables/` to `src/platform/nodeReplacement/missingNodeScan.ts`, renamed to reflect it is a plain function not a Vue composable (Issues #9254) - Refactored `SwapNodeGroupRow.vue` to emit a `'replace'` event instead of calling `useNodeReplacement()` and `useExecutionErrorStore()` directly; replacement logic now handled in `TabErrors.vue` (Issue #9267) - Added unit tests for `removeMissingNodesByType` (`executionErrorStore.test.ts`), `scanMissingNodes` (`missingNodeScan.test.ts`), and `swapNodeGroups` computed (`swapNodeGroups.test.ts`, `useErrorGroups.test.ts`) (Issue #9270) - Added placeholder detection tests covering unregistered-type detection when `has_errors` is false, and exclusion of registered types (`useNodeReplacement.test.ts`) (Issue #9271) - Added component tests for `MissingNodeCard` and `MissingPackGroupRow` covering rendering, expand/collapse, events, install states, and edge cases (Issue #9231) - Added component tests for `SwapNodeGroupRow` and `SwapNodesCard` (Issues #9255, #9267) ## Additional Changes (Post-Review) - **Edge case guard in placeholder detection** (`useNodeReplacement.ts`): When `last_serialization.type` is absent (old serialization format), the predicate falls back to `n.type`, which the app may have already run through `sanitizeNodeName` — stripping HTML special characters (`& < > " ' \` =`). In that case, a `Set.has()` lookup against the original unsanitized type name would silently miss, causing replacement to be skipped. Fixed by including sanitized variants of each target type in the `targetTypes` Set at construction time. For the overwhelmingly common case (no special characters in type names), the Set deduplicates the entries and runtime behavior is identical to before. A regression test was added to cover the specific scenario: `last_serialization.type` absent + live `n.type` already sanitized. ## Review Focus - `TabErrors.vue`: confirm the new `@replace` event handler correctly replaces nodes and removes them from missing nodes list (mirrors the old inline logic in `SwapNodeGroupRow`) - `missingNodeScan.ts`: filename/export name change from `useMissingNodeScan` — verify all call sites updated via `app.ts` - Test mocking strategy: module-level `vi.mock()` factories use closures over `ref`/plain objects to allow per-test overrides without global mutable state - Fixes #9231 - Fixes #9254 - Fixes #9255 - Fixes #9267 - Fixes #9270 - Fixes #9271