[Routine - VT] fix: preserve sourceScopeId when duplicating a group

[winterdrive]

Pre-flight Check

Active branches/PRs checked before this PR:

• PR [codex] Fix VirtualTabs folder/group drag data transfer #66 (fix/issue-60-folder-drop-files-mime) — touches src/core/DropUriParser.ts, src/dragAndDrop.ts, src/provider.ts, and drag-related test files. No conflict: this PR only modifies src/commands.ts (the virtualTabs.duplicateGroup command handler), which is not touched by PR [codex] Fix VirtualTabs folder/group drag data transfer #66.

No other open PRs were found.

Changes

File: src/commands.ts — virtualTabs.duplicateGroup command handler (~line 543)

Before: the duplicated group object omitted sourceScopeId, so saveGroupsImmediate() in provider.ts fell back to the first available ConfigScope (backward-compat path, line 352–360) regardless of which scope the original group belonged to. In a multi-scope workspace this silently saved the duplicate to the wrong scope.

After: sourceScopeId: group.sourceScopeId is copied to the new group, routing the save to the correct scope.

 provider.groups.push({
     id: Date.now().toString() + Math.random().toString(36).substring(2, 9),
     name: newName,
-    files: group.files ? [...group.files] : []
+    files: group.files ? [...group.files] : [],
+    sourceScopeId: group.sourceScopeId
 });

Safety Verification

npm test
> tsc -p ./ && jest --runInBand

Test Suites: 23 passed, 23 total
Tests:       160 passed, 160 total
Snapshots:   0 total
Time:        10.708 s
Ran all test suites.

TypeScript compilation (tsc -p ./) succeeded with zero errors as part of the test run. No lint/format scripts exist in this project.

🤖 Generated with Claude Code