Fix how URL concatenation works

[TheCactusBlue]

---

Important

Introduced urlString for URL concatenation with encoding and updated StackServerInterface methods to use it.

• Behavior:
  • Introduced urlString template literal tag in urls.tsx for URL concatenation with encoding.
  • Updated StackServerInterface methods to use urlString for URL paths.
• Functions:
  • Simplified templateIdentity in strings.tsx to reduce code complexity.
• Scripts:
  • Updated process-css.ts to use template literals for globalCSS export.

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