fix(daily): keep the coach check-in constants out of the client bundle

The Today hero and the check-in hook imported the check-in intent constants
from digest.ts, which — since the milestone slice — transitively reaches the
database through the streak baseline engine. That pulled the Postgres driver
into the client bundle (a Turbopack 'Can't resolve net/tls/dns' build failure
the worktree build couldn't surface). Move the four constants to a tiny,
dependency-free coach-checkin-intents module; the client imports them from
there, and digest.ts (the server builder) stays server-only.

src/components/daily/today-hero.tsx

@@ -46,11 +46,11 @@ import { useTranslations } from "@/lib/i18n/context";
 import { cn } from "@/lib/utils";
 import type { ScoreRingId } from "@/lib/dashboard-layout";
 import type { DashboardScoreRing } from "@/lib/dashboard/score-rings";
+import type { DailyDigest } from "@/lib/daily/digest";
 import {
   COACH_CHECKIN_KEEP_INTENT,
   COACH_CHECKIN_LETGO_INTENT,
-  type DailyDigest,
-} from "@/lib/daily/digest";
+} from "@/lib/daily/coach-checkin-intents";
 
 /**
  * v1.29.0 — the selected score rings return to the hero. The maps mirror the