Various build shenenigans (#5)

This PR extends the build pipeline of the www service to support
locale-prefixed static builds (EN/RU) with build-time SSG output
injection, while also refactoring UI typography to a tokenized Tailwind
v4 @theme-driven approach.

Changes:

- Add build-time SSG plugin to @ermnvldmr/rsbuild-config and wire
multi-locale builds (/en/, /ru/) into services/www.
- Introduce new @ermnvldmr/i18n package (locale constants, path helpers,
keysets, pluralization) and apply it to www navigation/text.
- Refactor ui typography to a shared getTypographyClassNames utility +
Tailwind token definitions, with stl/cn updated for correct
Tailwind-merge behavior.

services/www/package.json

@@ -6,6 +6,10 @@
   "scripts": {
     "dev": "rsbuild dev",
     "build": "rsbuild build",
+    "build:en": "LOCALE=en rsbuild build",
+    "build:ru": "LOCALE=ru rsbuild build",
+    "build:all": "pnpm run build:en && pnpm run build:ru",
+    "build:analyze": "RSDOCTOR=true rsbuild build",
     "preview": "rsbuild preview",
     "lint": "eslint src --max-warnings 0",
     "format": "prettier --write .",
@@ -22,12 +26,11 @@
     "build-storybook": "storybook build -c .config/storybook"
   },
   "dependencies": {
+    "@ermnvldmr/i18n": "workspace:*",
     "@ermnvldmr/stl": "workspace:*",
     "@ermnvldmr/ui": "workspace:*",
     "react": "^19.1.0",
     "react-dom": "^19.1.0",
-    "simplex-noise": "^4.0.3",
-    "suncalc": "^1.9.0",
     "tailwindcss": "^4.1.4"
   },
   "devDependencies": {
@@ -37,6 +40,7 @@
     "@rsbuild/core": "^1.2.11",
     "@rsbuild/plugin-babel": "^1.1.0",
     "@rsbuild/plugin-mdx": "^1.1.1",
+    "@rsdoctor/rspack-plugin": "^1.5.3",
     "@storybook/addon-a11y": "^8.6.15",
     "@storybook/addon-coverage": "^3.0.0",
     "@storybook/addon-essentials": "^8.6.15",
@@ -50,9 +54,9 @@
     "@testing-library/jest-dom": "^6.9.1",
     "@testing-library/react": "^16.3.1",
     "@testing-library/user-event": "^14.6.1",
+    "@types/node": "*",
     "@types/react": "^19.1.2",
     "@types/react-dom": "^19.1.2",
-    "@types/suncalc": "^1.9.2",
     "@vitest/coverage-v8": "^4.0.18",
     "babel-plugin-istanbul": "^7.0.1",
     "concurrently": "^9.1.2",
@@ -70,7 +74,6 @@
     "ts-node": "^10.9.2",
     "typescript": "^5.8.3",
     "vitest": "^4.0.18",
-    "wait-on": "^8.0.3",
-    "@types/node": "*"
+    "wait-on": "^8.0.3"
   }
 }