Conflicts resolved:
- sw.js: bumped CACHE_NAME to dienstplan-pro-v4 (was v3 + v2). Both
variants.js and image-import.js are in ASSETS.
- storage.js: kept STORAGE_KEY_DUTIES + STORAGE_KEY_VACATION (Feature B)
alongside STORAGE_KEY_OPENROUTER_KEY/MODEL + DEFAULT_MODEL (Feature A).
- styles.css: appended Feature B variants/vacation/date-stepper rules
after Feature A modal/key rules; both blocks coexist.