Two-part fix from m's 2026-05-21 finding that the Schriftsätze tab
told users "Bitte zuerst einen Verfahrenstyp setzen" while the
project form had no field to set it. The `proceeding_type_id`
column was already on `paliad.projects` and accepted by the API.
Part 1 — Verfahrenstyp picker on the case-fields block
* frontend/src/components/ProjectFormFields.tsx — new optional
<select id="project-proceeding-type-id"> rendered between
Aktenzeichen and Mandantenrolle inside the type=case block.
First option is "(nicht gesetzt)" / "(unset)".
* frontend/src/client/project-form.ts — shared
loadProceedingTypes() + populateProceedingTypeSelect()
helpers. Options sorted by `code` (de.* → dpma.* → epa.* →
upc.*). readPayload sends `proceeding_type_id` only when the
user picked a value; prefillForm restores the saved id via
dataset.preselect to survive the async populate race.
* frontend/src/client/projects-new.ts — kicks off populate on
DOMContentLoaded.
* frontend/src/client/projects-detail.ts — edit-modal preload
now awaits populate; the local loadProceedingTypes duplicate
(used by the counterclaim modal) is replaced by the shared
helper so both surfaces hit the same cache.
Part 2 — Actionable empty-state on the Schriftsätze tab
* frontend/src/projects-detail.tsx — the static <p> empty-state
becomes a div with a "Projekt bearbeiten" button.
* frontend/src/client/projects-detail.ts — openEditModal now
accepts an optional focusFieldID; the new
#project-submissions-edit-cta click handler calls it with
"project-proceeding-type-id" so the picker is scrolled into
view and focused right after the modal opens.
i18n: new keys projects.field.proceeding_type{,.unset,.hint} and
projects.detail.submissions.empty.no_proceeding.cta; reworded
no_proceeding copy to match the new "edit the project" CTA.
Backend already validates via validateProceedingTypeCategory
(mig 087/088 fristenrechner-category guard). Added
TestProjectService_CaseProceedingTypePicker exercising both the
happy and reject paths through a `case`-typed Create.
Manual test path: open any case project → Edit → the Verfahrenstyp
picker shows below Aktenzeichen → save → the Schriftsätze tab now
lists the submission codes. Clicking the empty-state CTA jumps
straight to the picker.