Phase 1 of the scene-scope empty state plan (docs/plans/scene-scope-
empty-state.md). When the active scene's scope tags filter a module
down to zero results, the ListView now shows a dedicated empty state
with a one-click "Bereich zurücksetzen" button instead of the generic
"Keine Aufgaben"/"Keine Treffer" message. Previously the user couldn't
tell whether the list was empty because of missing data or because of
the scope filter.
- New `ScopeEmptyState.svelte` shared component.
- New `hasActiveSceneScope()` reactive helper on the scene-scope store.
- Wired into todo, notes, calendar, contacts ListViews — the four
modules that currently use `filterBySceneScopeBatch`.
- 4 unit tests for the scope primitives.
Phase 2 (per-module hidden count) and Phase 3 (persistent scope badge)
remain optional follow-ups.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
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