"Now" status scan experience — show what you're currently up to

Experience #9 (lite): a published card can carry a "Now" line shown with a live
pulsing dot, so a scanned profile reflects what the person is currently doing.

- Backend: demo publish accepts optional `now` -> definition.profile.now; test
  asserts it. Gate green (120 tests).
- Web: renders a "Now: …" block with an animated green dot. astro check clean.
- Mobile: a "Now" field on the publish screen.

Verified live alongside a link payload (CTA button).

Co-Authored-By: Claude Opus 4.8 (1M context) <[email protected]>

cardclaws-backend/crates/cardclaws-api/tests/cards_test.rs

@@ -345,7 +345,8 @@ async fn demo_publish_creates_scannable_profile_with_welcome() {
                 "links": [{ "label": "Site", "url": "https://cardclaws.com" }],
                 "welcomePrompt": "a calm forest at dawn",
                 "welcomeMessage": "Great to meet you",
-                "payload": { "kind": "code", "label": "20% off", "value": "CARD20" }
+                "payload": { "kind": "code", "label": "20% off", "value": "CARD20" },
+                "now": "Building CardClaws · open to design partners"
             })),
         )
         .await;
@@ -364,6 +365,10 @@ async fn demo_publish_creates_scannable_profile_with_welcome() {
         profile["definition"]["profile"]["payload"]["value"],
         "CARD20"
     );
+    assert_eq!(
+        profile["definition"]["profile"]["now"],
+        "Building CardClaws · open to design partners"
+    );
 }
 
 #[tokio::test]