Brand the app with the Wallace tartan and a Celtic splash

- The launcher icon is a single square of the tartan, drawn as a vector
  so it stays sharp at any density and ships no PNGs. The adaptive
  icon's foreground is deliberately empty: the cloth is the icon.
- Tartan.kt draws the sett as warp, then as weft at half opacity. That
  overlap is what gives the blended squares and reads as woven cloth
  rather than a printed grid, and it is reused by both the icon and the
  splash.
- The app opens on the tartan under "Pro Libertate Games" in Uncial
  Antiqua, holds two seconds, then fades. It is an overlay rather than a
  destination, so the menu is already composed behind it and the fade
  reveals a live screen. The window background is set to a dark red so
  launch does not flash white before Compose draws.

Two things to be aware of:

- WallaceSett is an approximation. It reads as Wallace — bold red and
  black check with a narrow gold overstripe — but the registered
  threadcount could not be verified here, so the counts were chosen to
  look right. They are plain data and can be swapped for the registered
  ones without touching anything else.
- Uncial Antiqua is bundled under the SIL Open Font License 1.1, with
  the full licence at docs/licenses/UncialAntiqua-OFL.txt. The OFL
  requires that to be distributed with the font, so it must not be
  separated from it.

Co-Authored-By: Claude Opus 5 <[email protected]>
Claude-Session: https://claude.ai/code/session_015qjfMiPUDshdKEUa6vxqzN

README.md

@@ -57,6 +57,31 @@ them.
   - **Production** — stable builds, published from `main`.
   - **Dev** — preview builds, published from `dev` on every green CI run.
 
+## Branding
+
+The launcher icon is a single square of the Wallace tartan, and the app opens on
+a tartan splash carrying the name in a Celtic uncial hand for two seconds before
+fading into the menu.
+
+The tartan is drawn, not an image: `ui/theme/Tartan.kt` lays the sett down as
+warp and then as weft at half opacity, which is what produces the blended
+squares instead of a flat grid. The icon is the same construction as a vector
+drawable, so it stays sharp at every density and needs no PNGs.
+
+Two honest caveats:
+
+- **The sett is an approximation.** `WallaceSett` reproduces what the Wallace
+  tartan reads as — a bold red and black check divided by a narrow gold
+  overstripe — but the registered threadcount could not be verified, so the
+  numbers were chosen to look right rather than to be authoritative. They are
+  plain data; replacing them with the registered counts rebrands the whole app
+  and needs no other change.
+- **The typeface is bundled under a licence.** Uncial Antiqua, © 2011 Brian J.
+  Bonislawsky DBA Astigmatic, Reserved Font Name "Uncial Antiqua", used under
+  the SIL Open Font License 1.1. The full licence is at
+  [docs/licenses/UncialAntiqua-OFL.txt](docs/licenses/UncialAntiqua-OFL.txt) and
+  must stay with the font — the OFL requires it to be distributed alongside.
+
 ## Screen sizes
 
 There are no fixed orientations or hard-coded card sizes. Layouts measure the