Replace the sample data with synthetic fixtures and regenerate goldens and thumbnails

The template harness, tests and thumbnails now use a neutral vendor, bank account and
a generated sample wordmark (scripts/logo/make-sample-logo.mjs). Layout goldens and the
14 picker thumbnails are regenerated. Fixture strings keep their original lengths where
layout tests depend on them.

src-tauri/src/gst.rs

@@ -18,7 +18,7 @@ pub const STATES: &[(&str, &str)] = &[
     ("09", "Uttar Pradesh"),
     ("10", "Bihar"),
     ("11", "Sikkim"),
-    ("12", "Sampleachal Pradesh"),
+    ("12", "Arunachal Pradesh"),
     ("13", "Nagaland"),
     ("14", "Manipur"),
     ("15", "Mizoram"),