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.

actions/employees.ts

@@ -3,7 +3,7 @@
 import { revalidatePath } from "next/cache";
 import { sanitizeIlikeTerm } from "@/lib/supabase/query";
 import { createClient } from "@/lib/supabase/server";
-import type { Database } from "@/lib/supabase/types";
+import type { CollectiveAgreement, Database, NoteCategory, RelationshipType, Weekday, WorkerType } from "@/lib/supabase/types";
 
 type ActionResult = { success: boolean; error?: string };
 type MutationFn = keyof Database["public"]["Functions"];
@@ -19,6 +19,8 @@ async function callRpc(fn: MutationFn, payload: Record<string, unknown>, revalid
 export async function hireEmployee(payload: {
   first_name: string;
   last_name: string;
+  title_prefix?: string[];
+  title_suffix?: string[];
   gender: "m" | "w";
   birth_date: string;
   sv_nummer?: string;
@@ -34,6 +36,13 @@ export async function hireEmployee(payload: {
   weekly_hours?: number;
   paygrade?: "A" | "B" | "C" | "D" | "E" | "F";
   source: "Intern" | "Extern";
+  worker_type?: WorkerType;
+  collective_agreement?: CollectiveAgreement;
+  work_days?: Weekday[];
+  is_betriebsrat?: boolean;
+  has_dienstwagen?: boolean;
+  is_laterale_fuehrung?: boolean;
+  is_c_level?: boolean;
 }): Promise<ActionResult & { employeeId?: string }> {
   const supabase = await createClient();
   const { data, error } = await supabase.rpc("hire_employee", { payload });
@@ -102,6 +111,7 @@ export async function changeEmployeeData(payload: {
   effective_date: string;
   person: Record<string, unknown>;
   contract: Record<string, unknown>;
+  role: Record<string, unknown>;
 }): Promise<ActionResult> {
   return callRpc("change_employee_data", payload, [`/employees/${payload.employee_id}`, "/employees"]);
 }
@@ -110,9 +120,42 @@ export async function rehireEmployee(payload: { employee_id: string; rehire_date
   return callRpc("rehire_employee", payload, [`/employees/${payload.employee_id}`, "/employees", "/"]);
 }
 
+export async function addEmployeeDependent(payload: {
+  employee_id: string;
+  first_name: string;
+  last_name: string;
+  relationship: RelationshipType;
+  sv_nummer?: string;
+  birth_date: string;
+  effective_date: string;
+}): Promise<ActionResult> {
+  return callRpc("add_employee_dependent", payload, [`/employees/${payload.employee_id}`]);
+}
+
+export async function deleteEmployeeDependent(payload: {
+  dependent_id: string;
+  employee_id: string;
+  effective_date: string;
+}): Promise<ActionResult> {
+  return callRpc("delete_employee_dependent", payload, [`/employees/${payload.employee_id}`]);
+}
+
+export async function addEmployeeNote(payload: {
+  employee_id: string;
+  category: NoteCategory;
+  note_text: string;
+  due_date?: string;
+}): Promise<ActionResult> {
+  return callRpc("add_employee_note", payload, [`/employees/${payload.employee_id}`, "/"]);
+}
+
+export async function completeEmployeeNote(payload: { note_id: string; employee_id: string }): Promise<ActionResult> {
+  return callRpc("complete_employee_note", payload, [`/employees/${payload.employee_id}`, "/"]);
+}
+
 export type EmployeeSearchResult = { id: string; first_name: string; last_name: string; job_title: string; team_id: string | null };
 
-// Shared by "Intern besetzen" (staff an open position) and the reorg
+// Shared by "Position besetzen" (staff an open position) and the reorg
 // workbench's "Mitarbeiter:in(nen)" multi-select — both search active/
 // on-leave employees by name or title.
 export async function searchActiveEmployees(query: string): Promise<EmployeeSearchResult[]> {