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/employees/EmployeeDetail.tsx

@@ -5,7 +5,7 @@ import Link from "next/link";
 import { useState } from "react";
 import { Avatar } from "@/components/ui/Avatar";
 import { StatusChip } from "@/components/ui/StatusChip";
-import { tenure } from "@/lib/format";
+import { fmtFullName, tenure } from "@/lib/format";
 import type { Database } from "@/lib/supabase/types";
 import { DatenAendernPanel } from "./panels/DatenAendernPanel";
 import { KarenzPanel } from "./panels/KarenzPanel";
@@ -14,6 +14,7 @@ import { RehirePanel } from "./panels/RehirePanel";
 import { TerminatePanel } from "./panels/TerminatePanel";
 import { TransferPanel } from "./panels/TransferPanel";
 import { HistorieTab } from "./tabs/HistorieTab";
+import { NotizenTab } from "./tabs/NotizenTab";
 import { OrganisationTab } from "./tabs/OrganisationTab";
 import { StammdatenTab } from "./tabs/StammdatenTab";
 import { VertragTab } from "./tabs/VertragTab";
@@ -24,6 +25,8 @@ type Department = Database["public"]["Tables"]["departments"]["Row"];
 type Team = Database["public"]["Tables"]["teams"]["Row"];
 type Location = Database["public"]["Tables"]["locations"]["Row"];
 type HistoryRow = Database["public"]["Tables"]["employee_history"]["Row"];
+type Dependent = Database["public"]["Tables"]["employee_dependents"]["Row"];
+type NoteRow = Database["public"]["Tables"]["employee_notes"]["Row"];
 type MiniEmployee = { id: string; first_name: string; last_name: string; job_title: string; status?: string };
 type OpenPosition = { id: string; position_number: string; title: string; team_id: string; is_lead: boolean };
 
@@ -32,6 +35,8 @@ type EmployeeDetailProps = {
   manager: MiniEmployee | null;
   directReports: MiniEmployee[];
   history: HistoryRow[];
+  dependents: Dependent[];
+  notes: NoteRow[];
   divisions: Division[];
   departments: Department[];
   teams: Team[];
@@ -40,10 +45,10 @@ type EmployeeDetailProps = {
 };
 
 type PanelType = "transfer" | "promote" | "karenz" | "daten" | "terminate" | "rehire" | null;
-const TABS = ["Stammdaten", "Vertrag", "Organisation", "Historie"] as const;
+const TABS = ["Stammdaten", "Vertrag", "Organisation", "Historie", "HR-Notizen"] as const;
 
 export function EmployeeDetail(props: EmployeeDetailProps) {
-  const { employee, manager, directReports, history, divisions, departments, teams, locations } = props;
+  const { employee, manager, directReports, history, dependents, notes, divisions, departments, teams, locations } = props;
   const [tab, setTab] = useState<(typeof TABS)[number]>("Stammdaten");
   const [panel, setPanel] = useState<PanelType>(null);
 
@@ -54,6 +59,7 @@ export function EmployeeDetail(props: EmployeeDetailProps) {
   const location = locations.find((l) => l.id === employee.location_id);
 
   const isActive = employee.status === "Aktiv" || employee.status === "Karenz";
+  const canEditData = employee.status !== "Ausgetreten";
 
   return (
     <div className="flex flex-col gap-6">
@@ -68,7 +74,7 @@ export function EmployeeDetail(props: EmployeeDetailProps) {
             <div>
               <div className="flex items-center gap-2">
                 <h2 className="text-xl font-extrabold text-ink">
-                  {employee.first_name} {employee.last_name}
+                  {fmtFullName(employee.first_name, employee.last_name, employee.title_prefix, employee.title_suffix)}
                 </h2>
                 <StatusChip status={employee.status} entryDate={employee.entry_date} />
               </div>
@@ -87,15 +93,17 @@ export function EmployeeDetail(props: EmployeeDetailProps) {
                 <ActionButton icon={ArrowRightLeft} label="Versetzen" onClick={() => setPanel("transfer")} />
                 <ActionButton icon={TrendingUp} label="Befördern" onClick={() => setPanel("promote")} />
                 <ActionButton icon={Clock} label={employee.status === "Karenz" ? "Karenz verwalten" : "Karenz"} onClick={() => setPanel("karenz")} />
-                <ActionButton icon={Pencil} label="Daten ändern" onClick={() => setPanel("daten")} />
-                <button
-                  onClick={() => setPanel("terminate")}
-                  className="flex items-center gap-1.5 rounded border border-danger-solid px-3 py-1.5 text-sm font-semibold text-danger-solid hover:bg-danger-bg"
-                >
-                  <XCircle className="h-4 w-4" /> Austritt
-                </button>
               </>
             )}
+            {canEditData && <ActionButton icon={Pencil} label="Daten ändern" onClick={() => setPanel("daten")} />}
+            {isActive && (
+              <button
+                onClick={() => setPanel("terminate")}
+                className="flex items-center gap-1.5 rounded border border-danger-solid px-3 py-1.5 text-sm font-semibold text-danger-solid hover:bg-danger-bg"
+              >
+                <XCircle className="h-4 w-4" /> Austritt
+              </button>
+            )}
             {employee.status === "Ausgetreten" && (
               <button
                 onClick={() => setPanel("rehire")}
@@ -117,16 +125,19 @@ export function EmployeeDetail(props: EmployeeDetailProps) {
               tab === t ? "border-brand-500 text-brand-700" : "border-transparent text-ink-muted hover:text-ink"
             }`}
           >
-            {t}
+            {t === "HR-Notizen" ? `HR-Notizen ${notes.length}` : t}
           </button>
         ))}
       </div>
 
       <div className="rounded border border-border bg-white p-6">
-        {tab === "Stammdaten" && <StammdatenTab employee={employee} location={location} />}
+        {tab === "Stammdaten" && <StammdatenTab employee={employee} location={location} dependents={dependents} />}
         {tab === "Vertrag" && <VertragTab employee={employee} />}
-        {tab === "Organisation" && <OrganisationTab manager={manager} directReports={directReports} breadcrumb={breadcrumb} />}
+        {tab === "Organisation" && (
+          <OrganisationTab employeeId={employee.id} manager={manager} directReports={directReports} breadcrumb={breadcrumb} />
+        )}
         {tab === "Historie" && <HistorieTab history={history} />}
+        {tab === "HR-Notizen" && <NotizenTab employeeId={employee.id} notes={notes} />}
       </div>
 
       <TransferPanel
@@ -140,7 +151,7 @@ export function EmployeeDetail(props: EmployeeDetailProps) {
       />
       <PromotePanel open={panel === "promote"} onClose={() => setPanel(null)} employee={employee} />
       <KarenzPanel open={panel === "karenz"} onClose={() => setPanel(null)} employee={employee} />
-      <DatenAendernPanel open={panel === "daten"} onClose={() => setPanel(null)} employee={employee} />
+      <DatenAendernPanel open={panel === "daten"} onClose={() => setPanel(null)} employee={employee} dependents={dependents} />
       <TerminatePanel open={panel === "terminate"} onClose={() => setPanel(null)} employee={employee} directReportCount={directReports.length} />
       <RehirePanel open={panel === "rehire"} onClose={() => setPanel(null)} employee={employee} />
     </div>