Add multi-workspace selector scope

docs/TASKS/workspaces/001-all-workspaces-selector.md

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+# All Workspaces Selector
+
+## Feature
+
+Workspace navigation and cross-workspace content visibility.
+
+## Goal
+
+Allow users with access to multiple workspaces to select an "All Workspaces" scope from the workspace selector and view combined workspace data in list/calendar style views.
+
+## Scope
+
+- Add an explicit all-workspaces selection state to the frontend workspace store.
+- Add an "All Workspaces" entry as the first workspace selector item.
+- Add per-workspace visibility toggles for the all-workspaces aggregate scope.
+- Fetch list data without `workspaceId` when all workspaces are selected.
+- Filter all-workspaces list data to the currently visible workspace set.
+- Keep creation and workspace settings actions scoped to a concrete workspace.
+
+## Likely Files
+
+- `frontend/src/features/workspaces/stores/workspaceStore.js`
+- `frontend/src/layouts/main/WorkspaceSelector.vue`
+- `frontend/src/features/content/stores/contentItemsStore.js`
+- `frontend/src/features/campaigns/stores/campaignsStore.js`
+- `frontend/src/features/clients/stores/clientsStore.js`
+- `frontend/src/features/channels/stores/channelsStore.js`
+- `frontend/src/locales/en.json`
+- `frontend/src/locales/fr.json`
+
+## Validation
+
+- `cd frontend && npm run build`