feat(settings): a quiet Buy me a coffee link

A donate link belongs in Settings and nowhere in the way — so it sits last,
understated, below the device list. A plain anchor with an inline SVG cup:
no third-party script, no webfont, no tracking, so it works offline and
cannot phone home. Wording says the app is MIT with nothing held back and
that nothing changes if you don't pay.

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

web/src/lib/locales/en.js

@@ -262,6 +262,10 @@ export const en = {
 		'Where you are signed in. If you do not recognise one, sign it out and change your password.',
 	'account.thisDevice': 'this device',
 	'account.signOutDevice': 'Sign out',
+	'account.support': 'Support the project',
+	'account.supportHint':
+		'verdande is free, open-source software under the MIT licence — no paid tier, nothing held back. If it saved you an afternoon, you can buy the maintainer a coffee. Entirely optional, and nothing in the app changes either way.',
+	'account.buyCoffee': 'Buy me a coffee',
 
 	'account.totpEnabled': 'On.',
 	'account.recoveryLeftOne': '{n} recovery code left.',