feat: add Support tab — donations + co-branding/white-label contact

New tab under the Giving hub, alongside Zakat/Sadaqah/Khairat. Two parts:

Donations: amount presets + custom amount, four frequencies (One-Time,
Monthly, Quarterly, Yearly), each mapped to its own live Polar.sh
checkout link (merchant of record — this app never touches payment
details, same 'log intent, don't move money' principle used everywhere
else). Design/copy modeled on the sibling moslem03.falahos.my app's
existing Support tab, per direct reference.

No donation product existed on the Polar account yet, so created one
via the Polar API with the user's explicit go-ahead: 'Support Nur
Falah' as 4 pay-what-you-want products (one-time + monthly/quarterly/
yearly recurring, quarterly via recurring_interval=month with count=3
since Polar has no native quarterly interval), plus a hosted checkout
link for each. Verified all four resolve to genuinely distinct, live
Stripe-backed checkout sessions before shipping — moslem03's own
checkout.polar.sh URL pattern turned out to be stale/non-resolving;
the current correct domain is buy.polar.sh via the /v1/checkout-links
API, discovered from Polar's live OpenAPI spec rather than guessed.

Partnership section: co-branding and white-label pitch with the VP
Sales contact info given directly — info@falahos.my and WhatsApp
+60132250691 — reachable via a 'View Partnership Opportunities' link
from the donation card, matching moslem03's UX pattern of surfacing
partnership discovery from the support flow.

Covered by e2e-support.cjs (14/14) — including opening all four
checkout links live and confirming each is a genuinely distinct,
resolving Stripe checkout session, not a dead or placeholder link.
Full regression: all suites pass (one confirmed transient flake on
rerun, unrelated to this change).

e2e-auth-helper.cjs

@@ -31,7 +31,7 @@ const HUB_OF_TAB = {
   'Coverage': 'Home',
   'Assets': 'Estate', 'Faraid': 'Estate', 'Insurance': 'Estate', 'Wassiyah': 'Estate',
   'Hibah': 'Estate', 'Family Waqf': 'Estate', 'Nominate': 'Estate', 'Claims (H2)': 'Estate',
-  'Zakat': 'Giving', 'Sadaqah': 'Giving', 'Khairat': 'Giving',
+  'Zakat': 'Giving', 'Sadaqah': 'Giving', 'Khairat': 'Giving', 'Support': 'Giving',
   'Tree': 'Family', 'Trigger': 'Family', 'Mutawalli': 'Family', 'Manage': 'Family', 'Neighbourhood': 'Family',
   'Prayer Times': 'Daily', 'Qibla': 'Daily', 'Quran': 'Daily', 'Locate': 'Daily'
 };