Org assignment history, mobile support, and a correctness pass

Data model
- employee_assignments records org placement over time (valid_from/valid_to),
  written by a trigger on `employees` rather than inside each RPC: ~70
  `update employees` statements spread over fifteen migrations mean per-call
  bookkeeping would miss paths today and again with every future RPC. A
  partial unique index enforces the one-open-interval invariant the trigger
  relies on when closing the current row.
- The Organigramm gains a Stichtag (default today). Membership comes from
  entry/exit/karenz, past placement from the new history, future placement
  projected from pending_org_changes. Placements predating the migration are
  backfilled with today's values and flagged as such in the UI, since
  employee_history only ever stored free text and cannot be reconstructed.

Correctness
- Reports and exports silently truncated at PostgREST's 1000-row cap
  (db.max_rows); employee_history is already past it at ~800 staff. Every
  whole-table read now pages explicitly.
- XLSX date cells were a day early: ExcelJS converts a Date to an Excel
  serial straight off getTime(), so a Date built at local midnight lands on
  the previous day's serial in any positive-offset zone.
- Date handling is pinned to Europe/Vienna throughout, and date-only strings
  are formatted without a Date round-trip. The dashboard's YTD window was
  built by round-tripping a local Date through toISOString(), which shifted
  it a day early and dropped 31 December entirely.
- Export routes parsed measure/group/split/eventType with unchecked `as`
  casts, so an unknown value reached column headers as `undefined` and the
  Content-Disposition filename. Parsed against the label maps now, with the
  filename slugged as a backstop.
- toXlsx keyed columns by header text, silently dropping the second of any
  two columns sharing a name — split columns take their header from data.
- The org chart tree walks had no cycle guard; nothing in the schema forbids
  a manager_id cycle, and one would hang the tab rather than misreport.
- The login page reflected ?error= verbatim, letting anyone put arbitrary
  text on the real sign-in screen; messages are looked up by code now.
- React Flow needs elementsSelectable on, or it sets pointer-events:none on
  the whole node and the expand control stops responding.

UI
- Mobile: the shell was unusable below lg — a fixed 236px margin pushed
  content off-screen with no mobile navigation at all. The sidebar is now a
  drawer, dvh replaces vh, safe-area insets are honoured, inputs are 16px so
  iOS stops zooming on focus, and form grids stack.
- Org chart nodes redesigned: per-kind accent stripes and icons, vacant
  roles called out, expand control moved to the bottom edge carrying the
  child count.
- Pagination is windowed; it previously rendered one link per page (54 for
  the employee list, unbounded for the audit log).
- Positions page reduced to open positions with a single "Besetzen" action.
- The employee Organisation tab links into the org chart focused on that
  person, reusing the chart's existing search-match highlighting.

Also included, uncommitted until now
- Dependants, HR notes, academic titles, split address fields, position
  validity and role/employment fields, with their migrations and UI.
- Docker/compose deployment setup, data-model and security-review docs.

components/hire/StepSummary.tsx

@@ -1,4 +1,4 @@
-import { fmtDate } from "@/lib/format";
+import { fmtDate, fmtFullName } from "@/lib/format";
 import type { OpenPositionResolved } from "@/lib/positions";
 import type { HireDraftData } from "./types";
 
@@ -19,8 +19,14 @@ type StepSummaryProps = {
 
 export function StepSummary({ draft, selectedPosition, locations }: StepSummaryProps) {
   const location = locations.find((l) => l.id === draft.locationId);
+  const flags = [
+    draft.isBetriebsrat && "Betriebsrat",
+    draft.hasDienstwagen && "Dienstwagen",
+    draft.isLateraleFuehrung && "Laterale Führung",
+    draft.isCLevel && "C-Level",
+  ].filter(Boolean);
   const rows: [string, string][] = [
-    ["Name", `${draft.firstName} ${draft.lastName}`],
+    ["Name", fmtFullName(draft.firstName, draft.lastName, draft.titlePrefix, draft.titleSuffix)],
     ["Geschlecht", draft.gender === "m" ? "männlich" : "weiblich"],
     ["Geburtsdatum", fmtDate(draft.birthDate)],
     ["SV-Nummer", draft.svNummer || "–"],
@@ -35,11 +41,15 @@ export function StepSummary({ draft, selectedPosition, locations }: StepSummaryP
     ["Vertragsart", draft.contractType === "befristet" ? `befristet bis ${fmtDate(draft.contractEndDate)}` : "unbefristet"],
     ["Beschäftigungsausmaß", `${draft.employmentType} (${draft.weeklyHours} h)`],
     ["Paygrade", PAYGRADE_LABELS[draft.paygrade]],
+    ["Angestellte:r / Arbeiter:in", draft.workerType],
+    ["Kollektivvertrag", draft.collectiveAgreement],
+    ["Arbeitstage", draft.workDays.join(", ") || "–"],
+    ["Merkmale", flags.length > 0 ? flags.join(", ") : "–"],
   ];
 
   return (
     <div className="flex flex-col gap-4">
-      <dl className="grid grid-cols-2 gap-x-6 gap-y-3">
+      <dl className="grid grid-cols-1 gap-x-6 gap-y-3 sm:grid-cols-2">
         {rows.map(([label, value]) => (
           <div key={label}>
             <dt className="text-xs font-semibold uppercase tracking-wide text-ink-muted">{label}</dt>