fix: deterministic stagger, lint importmap/module, cache-bust previews

- Replace from:"random" with from:"center" stagger in us-map,
  world-map, spain-map — random stagger is non-deterministic across
  parallel render workers, causing visual jumps at chunk boundaries.

- Exempt type="importmap" and type="module" inline scripts from the
  invalid_inline_script_syntax lint rule. The rule used new Function()
  to parse, which rejects import statements and JSON import maps.
  Closes #929.

- Cache-bust all map MDX preview video URLs after re-rendering with
  the deterministic stagger fix.

packages/core/src/lint/rules/core.ts

@@ -157,7 +157,11 @@ export const coreRules: Array<(ctx: LintContext) => HyperframeLintFinding[]> = [
     const findings: HyperframeLintFinding[] = [];
     for (const script of scripts) {
       const attrs = script.attrs || "";
-      if (/\bsrc\s*=/.test(attrs) || /\btype\s*=\s*["']application\/json["']/.test(attrs)) continue;
+      if (
+        /\bsrc\s*=/.test(attrs) ||
+        /\btype\s*=\s*["'](?:application\/json|importmap|module)["']/.test(attrs)
+      )
+        continue;
       const syntaxError = getInlineScriptSyntaxError(script.content);
       if (!syntaxError) continue;
       findings.push({