Print a checklist without printing the application around it

The checklist gets a print view: one A4 page, header carrying personnel
number, name, date of extract, entry date and position, the items in two
flowing columns so twenty-five fit, and two signature lines at the foot.
It prints the *state*, dated — not a blank form.

The default filename in the save dialog comes from the document title,
which is set to the agreed convention:

  20260818_2884_Aigner-Manuel_Onboarding-Checklist

Surname first, like everywhere else in the application, so a folder of
these sorts by person and within a person by date. Umlauts are resolved
rather than stripped: the naive route (NFKD, then every non-ASCII to a
dash) turns "Müller" into "Mu-ller", because decomposition splits the
umlaut and the diaeresis becomes the dash. "Weiß" needs its own rule —
it has no decomposition and would otherwise vanish.

The reported defect: the printout carried the application's own top bar
— hamburger, bell, "Neueinstellung", sign-out. Those are controls; on
paper they are decoration, and on a checklist filed in a personnel
record, misleading. The rule now sits on AppShell rather than on this
one page, so the org-chart print view — which had the same problem —
gets it too, along with anything printed later. The shell's padding goes
with it: the type area is set by @page on the print page itself, and the
shell's would have been added on top.

The browser's own header line (date, title, URL) is separate — that is a
checkbox in the print dialog, not something CSS can reach.

440 tests pass, including 13 new ones pinning the filename convention.
Not yet seen in a browser.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>

components/employees/tabs/OnboardingTab.tsx

@@ -26,6 +26,7 @@ export function OnboardingTab({
       vorhanden={vorhanden}
       leerText="Für diese Person gibt es keine Onboarding-Checkliste. Sie entsteht mit einer Einstellung oder Wiedereinstellung — wer davor eingetreten ist, hat keine."
       anlegenLabel="Checkliste anlegen"
+      druckHref={`/employees/${employeeId}/checkliste?art=onboarding`}
       onSpeichern={(itemKey, teil) => setOnboardingTask({ employee_id: employeeId, item_key: itemKey, ...teil })}
       onAnlegen={() => startOnboarding(employeeId)}
     />