feat: add stickiness round — daily Sadaqah tracker + Family Tree social loop

Two features scoped from the stickiness brainstorm, sharing one digest
notification pipeline:

Sadaqah tracker (new tab): a private daily giving journal, not a payment
processor — the app logs, it never moves money. Streak tracking follows
the proven pattern from dedicated apps (Sidq, Daily Sadaqa). Family
visibility is strictly limited to streak counts via a SECURITY DEFINER
RPC (nf_family_sadaqah_streaks) — amounts, causes, and notes never cross
the member boundary, respecting the Islamic preference for giving
privately. Entries can be dedicated 'in memory of' a deceased person from
the Family Tree, with a memorial count (nf_memorial_sadaqah_count, count
only) surfacing on that person's card.

Family Tree social loop: a 'give sadaqah in memory of' link on every
deceased person's card (cross-tab jump via a small requestedTab store in
nav.js), plus completeness hints (missing birth date, missing photo,
no relationships linked) feeding directly into the existing Coverage
Dashboard recommendations engine rather than a new UI surface.

Daily digest Edge Function + pg_cron (07:00 UTC): batches into one email
per family member per day, sent only when there's real content — tree
activity in the last 24h, a birthday/death-anniversary today, or a
weekly sadaqah recap on Sundays. An empty day sends nothing, deliberately
avoiding the notification-spam failure mode the research flagged.
Protected by a shared secret header since it's cron-invoked, not
user-triggered. Verified with a live manual invocation before relying on
the schedule.

Found and fixed two real bugs in nf_family_sadaqah_streaks during E2E
testing: an ambiguous unqualified 'member_id' column reference colliding
with the function's OUT parameter (42702), and a bigint/int type mismatch
from count(*) (42804) — both would have 400'd on every call in production.

Covered by e2e-sadaqah-tree.cjs (12/12). Full regression: 280/280 across
all suites.

src/lib/recommendations.js

@@ -8,7 +8,8 @@ export function buildRecommendations(data) {
   const {
     exposedTotal = 0, exposedCount = 0, unverifiedCount = 0, wassiyahCount = 0, estateTotal = 0,
     insuranceCount = 0, zakatConfigured = false, hasCashOrGold = false, unlinkedLiabilityCount = 0,
-    confirmedAttestorCount = 0, hasAgent = false, waqfConfigured = false
+    confirmedAttestorCount = 0, hasAgent = false, waqfConfigured = false,
+    missingBirthDateCount = 0, missingPhotoCount = 0, orphanPersonCount = 0
   } = data;
 
   const items = [];
@@ -44,6 +45,15 @@ export function buildRecommendations(data) {
   if (estateTotal > 0 && !waqfConfigured) {
     items.push({ severity: 'low', text: 'No Waqf designation set up. If any part of your estate is meant as a lasting charitable endowment, this is where to set it aside.', tab: 'Family Waqf' });
   }
+  if (orphanPersonCount > 0) {
+    items.push({ severity: 'low', text: `${orphanPersonCount} ${orphanPersonCount === 1 ? 'person has' : 'people have'} no relationships linked in your Family Tree — is a parent, child, or spouse missing?`, tab: 'Tree' });
+  }
+  if (missingBirthDateCount > 0) {
+    items.push({ severity: 'low', text: `${missingBirthDateCount} ${missingBirthDateCount === 1 ? 'person is' : 'people are'} missing a birth date in the Family Tree.`, tab: 'Tree' });
+  }
+  if (missingPhotoCount > 0) {
+    items.push({ severity: 'low', text: `${missingPhotoCount} ${missingPhotoCount === 1 ? 'person has' : 'people have'} no photo in the Family Tree.`, tab: 'Tree' });
+  }
 
   const order = { high: 0, medium: 1, low: 2 };
   return items.sort((a, b) => order[a.severity] - order[b.severity]);