fix: tour demo -- parsed.scenes must be an array, not a count

Verified the ported Tour feature live end-to-end (entry via ?mode=tour and
via Help > Welcome tour..., all 15 spotlight steps, FAQ landing, exit) and
found the one real bug: tour.js's canned preview.parsed was `{scenes: 3}`
-- a count, not an array. inspector.js's renderSplit() does
`(parsed.scenes || []).forEach(...)`, which throws the moment the Scene
preview panel renders during the tour. Confirmed identical in v4's
original tour.js -- a pre-existing bug carried over verbatim by the
byte-for-byte port, not something the port introduced.

Fixed by giving the demo preview a real 3-scene array matching the demo
project's own scene texts. Re-verified live: zero thrown errors across
the full tour sequence after the fix.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>

app/legacy/tour.js

@@ -264,7 +264,18 @@
       },
       preview: {
         combined_prompt: "Demo combined prompt preview",
-        parsed: { scenes: 3 },
+        // `parsed.scenes` is an array of {text} rendered by inspector.js's
+        // renderSplit() -- a bare count here throws on .forEach the moment
+        // that panel renders (pre-existing in v4's tour.js too, found while
+        // verifying this port live).
+        parsed: {
+          scenes: [
+            { text: "Wide establishing shot of the city at dawn, soft haze." },
+            { text: "B-roll alley clip." },
+            { text: "Close-up reaction, emotional beat, shallow depth of field." },
+          ],
+          transitions: [],
+        },
         warning: "",
         parse_error: "",
       },