build-ssg` CLI crashes: Vite SSR throws "Invalid or unexpected token" when evaluating generated `.less-ssg-entry.ts

[SisyphusZheng]

Body:

Description

deno task build:ssg (Phase 3 of the build pipeline) crashes immediately with a Vite SSR module evaluation error. The entire SSG build pipeline is unusable.

Steps to Reproduce

1. Run deno task build (Phase 1+2 completes successfully)
2. Run deno task build:ssg (Phase 3)

Error Output

[LessJS] Lit SSR adapter installed - TemplateResult to string
[vite] (ssr) Error when evaluating SSR module .less/.less-ssg-entry.ts: Invalid or unexpected token
    at new AsyncFunction (<anonymous>)
    at ESModulesEvaluator.runInlinedModule
    at SSRCompatModuleRunner.directRequest

Root Cause

The generated .less-ssg-entry.ts file contains:

1. An __ssr() helper function using template literals (backtick strings) like `<${tag}></${tag}>`
2. A massive ~7KB headExtras CSS string (JSON.stringify'd double-quoted) inlined into every route handler's wrapInDocument() call

When Vite SSR's AsyncFunction evaluator processes this mixed content (template literals + huge inline strings), it fails with "Invalid or unexpected token".

Environment

• Deno 2.x + Vite 8.0.10 + @lessjs/core@0.9.2
• Windows 11
• Project uses resolveAlias pointing to local src-tmp/packages/ sources

Severity

P0 — The entire SSG build pipeline is completely broken. No static HTML output can be generated.