fix(tests): fix type errors in spec files after adding user to App.PageData

Add user: undefined to baseData in conversations and documents/new specs.
Change null to undefined for filePath/transcription in makeDoc fixture.
Add form: null to render calls missing it.
Fix birthYear conversion from string to number in persons/[id] server action.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

frontend/src/routes/documents/new/page.svelte.spec.ts

@@ -8,6 +8,8 @@ afterEach(cleanup);
 // ─── Test data ────────────────────────────────────────────────────────────────
 
 const baseData = {
+	user: undefined,
+	canWrite: true,
 	persons: [],
 	initialSenderId: '',
 	initialSenderName: '',
@@ -18,14 +20,15 @@ const baseData = {
 
 describe('New document page – sender prefill', () => {
 	it('shows an empty sender input when no senderId is in the URL', async () => {
-		render(Page, { data: baseData });
+		render(Page, { data: baseData, form: null });
 		const input = document.querySelector<HTMLInputElement>('#senderId-search');
 		expect(input?.value).toBe('');
 	});
 
 	it('shows the sender name in the typeahead input when initialSenderName is set', async () => {
 		render(Page, {
-			data: { ...baseData, initialSenderId: 'p1', initialSenderName: 'Hans Müller' }
+			data: { ...baseData, initialSenderId: 'p1', initialSenderName: 'Hans Müller' },
+			form: null
 		});
 		const input = document.querySelector<HTMLInputElement>('#senderId-search');
 		expect(input?.value).toBe('Hans Müller');
@@ -33,7 +36,8 @@ describe('New document page – sender prefill', () => {
 
 	it('sets the hidden senderId input to the prefilled ID', async () => {
 		render(Page, {
-			data: { ...baseData, initialSenderId: 'p1', initialSenderName: 'Hans Müller' }
+			data: { ...baseData, initialSenderId: 'p1', initialSenderName: 'Hans Müller' },
+			form: null
 		});
 		const hidden = document.querySelector<HTMLInputElement>(
 			'input[type="hidden"][name="senderId"]'
@@ -46,7 +50,7 @@ describe('New document page – sender prefill', () => {
 
 describe('New document page – receiver prefill', () => {
 	it('shows no receiver chips when initialReceivers is empty', async () => {
-		render(Page, { data: baseData });
+		render(Page, { data: baseData, form: null });
 		await expect.element(page.getByText('Anna Schmidt')).not.toBeInTheDocument();
 	});
 
@@ -55,7 +59,7 @@ describe('New document page – receiver prefill', () => {
 			...baseData,
 			initialReceivers: [{ id: 'p2', firstName: 'Anna', lastName: 'Schmidt' }]
 		};
-		render(Page, { data });
+		render(Page, { data, form: null });
 		await expect.element(page.getByText('Anna Schmidt')).toBeInTheDocument();
 	});
 
@@ -64,7 +68,7 @@ describe('New document page – receiver prefill', () => {
 			...baseData,
 			initialReceivers: [{ id: 'p2', firstName: 'Anna', lastName: 'Schmidt' }]
 		};
-		render(Page, { data });
+		render(Page, { data, form: null });
 		const hidden = document.querySelector<HTMLInputElement>('input[name="receiverIds"]');
 		expect(hidden?.value).toBe('p2');
 	});