refactor: centralize brand, company info, assets and Persian strings

Phase 1 of turning the game into the company landing page.

- Add src/config/company.js with name, tagline, contact, about and the
  product line, plus a brand palette built around #00a693 (contrast
  checked); placeholders are marked TODO(company).
- Add src/config/assets.js listing every loaded file with its expected
  format; placeholders are marked TODO(asset).
- Move all Persian interface text, dialogue, missions and scenery text
  into src/i18n/fa.js; components and game code read from it.
- Expose the palette as CSS variables (--color-primary and shades) and
  Tailwind colours, and use it for 3D materials and map drawings.
- Fix the arrival line that still called the manager's car a white
  pickup.
- Add tests that block hard-coded Persian text and low-contrast colours.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

tests/content.test.js

@@ -0,0 +1,74 @@
+import test from 'node:test';
+import assert from 'node:assert/strict';
+import { readFileSync, readdirSync, statSync } from 'node:fs';
+import { join, relative } from 'node:path';
+import { COMPANY } from '../src/config/company.js';
+import { strings } from '../src/i18n/fa.js';
+
+const SRC = new URL('../src/', import.meta.url).pathname;
+// Persian text may only live in the strings file, the company config, map data and the list of
+// machine sites (place names and addresses are map content, not interface text).
+const ALLOWED = ['i18n/', 'config/', 'data/', 'constants/locations.js'];
+const PERSIAN = /[؀-ۿ]/;
+// Persian digits used for number formatting, not text.
+const DIGITS_ONLY = /^[۰-۹]$/;
+
+/**
+ * Lists source files below a folder.
+ * @param {string} dir - Folder to walk.
+ * @returns {string[]} File paths.
+ */
+function sourceFiles(dir) {
+  return readdirSync(dir).flatMap((name) => {
+    const path = join(dir, name);
+    if (statSync(path).isDirectory()) return sourceFiles(path);
+    return /\.(js|jsx)$/.test(name) && !/\.test\./.test(name) ? [path] : [];
+  });
+}
+
+/**
+ * WCAG contrast ratio between two #rrggbb colours.
+ * @param {string} a - First colour.
+ * @param {string} b - Second colour.
+ * @returns {number} Ratio from 1 to 21.
+ */
+function contrast(a, b) {
+  const luminance = (hex) => {
+    const [r, g, bl] = [1, 3, 5]
+      .map((i) => parseInt(hex.slice(i, i + 2), 16) / 255)
+      .map((c) => (c <= 0.03928 ? c / 12.92 : ((c + 0.055) / 1.055) ** 2.4));
+    return 0.2126 * r + 0.7152 * g + 0.0722 * bl;
+  };
+  const [high, low] = [luminance(a), luminance(b)].sort((x, y) => y - x);
+  return (high + 0.05) / (low + 0.05);
+}
+
+test('Interface text lives in the strings file, not in components or game code', () => {
+  const offenders = sourceFiles(SRC)
+    .map((path) => relative(SRC, path))
+    .filter((path) => !ALLOWED.some((allowed) => path.startsWith(allowed)))
+    .flatMap((path) =>
+      readFileSync(join(SRC, path), 'utf8')
+        .split('\n')
+        .map((line, i) => [line, i + 1])
+        .filter(([line]) => [...line].some((ch) => PERSIAN.test(ch) && !DIGITS_ONLY.test(ch)))
+        .map(([, n]) => `${path}:${n}`),
+    );
+  assert.deepEqual(offenders, []);
+});
+
+test('Brand palette keeps readable contrast', () => {
+  const c = COMPANY.colors;
+  assert.equal(c.primary, '#00a693');
+  assert.ok(contrast(c.primary, c.surface) >= 4.5, 'primary accents on dark surfaces');
+  assert.ok(contrast(c.onPrimary, c.primary) >= 4.5, 'text on primary buttons');
+  assert.ok(contrast(c.text, c.surface) >= 7, 'body text');
+  assert.ok(contrast(c.textMuted, c.surface) >= 4.5, 'secondary text');
+});
+
+test('Strings that take values build complete sentences', () => {
+  assert.equal(strings.prompts.getIn('بی‌ام‌و'), 'F · سوار بی‌ام‌و شو');
+  assert.equal(strings.units.hetoman('۵۰۰'), '۵۰۰ هتومان');
+  assert.ok(strings.briefing.subtitle.includes(COMPANY.shortName));
+  assert.equal(strings.ranks.length, 6);
+});