Lukas 3ef2370a34 Replace panel mode booleans with discriminated union ...

Three mutually exclusive state variables (selectedCreatureId,
bulkImportMode, sourceManagerMode) replaced with a single PanelView
union type, eliminating impossible states and boolean-clearing
boilerplate in handlers.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

2026-03-14 13:02:03 +01:00

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Replace panel mode booleans with discriminated union

2026-03-14 13:02:03 +01:00