feedback5 R5: split the match screen's standalone pieces out

The match-ended plate, the solo pause plate, the highlight styles and
keepEarly now live in public/js/screens/game/*.js. game.js stays the screen
entry. MatchScreen stays one component. Imports only those pieces used moved
with them. Two source pins follow the lines that moved.

public/js/screens/game/marks.js

@@ -0,0 +1,11 @@
+// public/js/screens/game/marks.js — class-name join and the field highlight styles the match screen passes to the view.
+
+export const cx = (...p) => p.flat().filter(Boolean).join(' ');
+
+export const HUD_HZ_MS = 200;
+
+/** Range tiles of the selected unit (its own highlight group: the wheel's 'facing' group may be up at the same time). */
+export const SEL_RANGE = Object.freeze({ group: 'selRange', color: 0xff9c33, fill: 0.3, line: 0.95 });
+
+/** The tile an armed merge-completing card's elite will take (its own group; gold like the promotion cue, render/fx.js). */
+export const MERGE_HL = Object.freeze({ group: 'mergeTile', color: 0xffd45a, fill: 0.34, line: 1 });