perf(faith/calendar): trim yearDays, send pre-filtered feastDots

yearDays was a 365-entry array (one per day in the LY window) with
{iso, name, rank, color, seasonKey} on each — the client only needed
the color (for the needle pin on the currently-selected day; RingView
re-did the feast filter itself). Split into:

- yearDays: {iso, color} — unchanged count, but ~60% smaller per entry
  (drops name, rank, seasonKey)
- feastDots: {iso, name, rank, color} — new, pre-filtered to
  rank > ferial server-side (~150 entries instead of 365)

RingView's `feastDots` derivation shrinks to filtering out just the
currently-selected day, and `activeFeasts` filters `feastDots` by arc
bounds instead of re-scanning yearDays. needleDay's color lookup still
works with the trimmed YearDay.

Also collapses a stray `locals.session ?? (locals.session ?? …)` the
earlier #5 sweep introduced in both calendar page loaders.

package.json

@@ -1,6 +1,6 @@
 {
 	"name": "homepage",
-	"version": "1.46.21",
+	"version": "1.46.22",
 	"private": true,
 	"type": "module",
 	"scripts": {