1. **Remove Billing-Referenz from the client create form.** Per m: the field stays
in the DB (projekte.billing_reference column) but no longer in the UI. Dropped
the input + label from akten-neu.tsx, the payload write from akten-neu.ts, and
the projekte.field.billing_reference i18n keys (DE + EN).
2. **Add a Notizen (Notes) free-text field to project create + detail at every level.**
Uses the existing projekte.description column (added in migration 018 — nullable
text). Not to be confused with the polymorphic Notizen feature (threaded notes
per projekt/frist/termin), which stays as-is.
- akten-neu.tsx: textarea (rows=4) inserted above the Status select, rendered
for every type (not type-conditional). akten-neu.ts: payload.description set
on submit when non-empty.
- akten-detail.tsx: new description block between header + tabs with
akte-description-display (read) + akte-description-edit (textarea, edit mode).
Edit/save flow on initTitleEdit extended to also PATCH description. Batch PATCH:
only sends keys that actually changed.
renderHeader() populates both, tags the wrapper data-empty=1 when nothing set
(CSS can hide when empty if desired).
- i18n: projekte.field.description / projekte.field.description.placeholder /
projekte.detail.description.heading in DE (Notizen) + EN (Notes).
go build/vet/test + bun run build all clean.
bde4b57099