feat(tasks): make a URL in a task's title or description clickable

A task is plain text — the title is an input, the description a textarea —
so a pasted URL just sat there as words. It is now caught at display time
and shown as a link in the list and on the board, without the stored text
ever being anything but plain text.

The link cannot live inside the row's open-button (an <a> in a <button> is
invalid), so the body is a container with the open action as an overlay
behind it: plain text and the meta row still open the task, links are
raised above and take their own click. Conservative about what counts —
an explicit http(s):// or a bare www. host, not every dotted word.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

web/e2e/smoke.spec.js

@@ -86,6 +86,29 @@ test('hurtig tilføjelse opretter en opgave, og den kan lukkes', async ({ page }
 	expect(trouble).toEqual([]);
 });
 
+test('en URL i en opgave bliver et klikbart link, og resten åbner opgaven', async ({ page }) => {
+	const trouble = watchForTrouble(page);
+	await page.goto('/');
+
+	const box = page.getByLabel('Ny opgave');
+	// The URL is one token, so the parser leaves it in the title; "i dag" is what it
+	// takes. The link is made at display time — the stored title is still plain text.
+	await box.fill('læs https://example.com/artikel i dag');
+	await box.press('Enter');
+
+	const row = page.locator('.row').filter({ hasText: 'læs' });
+	const link = row.getByRole('link', { name: 'https://example.com/artikel' });
+	await expect(link).toHaveAttribute('href', 'https://example.com/artikel');
+	await expect(link).toHaveAttribute('rel', /noopener/);
+
+	// Clicking anywhere but the link still opens the task — the open-overlay sits
+	// behind the text, the link above it.
+	await row.getByRole('button', { name: /læs https/ }).click();
+	await expect(page.getByRole('complementary', { name: 'Opgave' })).toBeVisible();
+
+	expect(trouble).toEqual([]);
+});
+
 test('hvert link i sidebjælken fører et sted hen', async ({ page }) => {
 	const trouble = watchForTrouble(page);
 	await page.goto('/');