fix(ci): use ## instead of # when comparing (#8448)

* fix(ci): use `##` instead of `#` when comparing

Signed-off-by: Aviv Keller <me@aviv.sh>

* Update apps/site/scripts/compare-size/index.mjs

Co-authored-by: Copilot <175728472+Copilot@users.noreply.github.com>
Signed-off-by: Aviv Keller <me@aviv.sh>

---------

Signed-off-by: Aviv Keller <me@aviv.sh>
Co-authored-by: Copilot <175728472+Copilot@users.noreply.github.com>

Author: avivkeller

apps/site/scripts/compare-size/index.mjs

@@ -82,7 +82,7 @@ function reportDiff({ assets: oldAssets }, { assets: newAssets }) {
   const totalDelta = newTotal - oldTotal;
 
   // Summary table
-  let report = `# 📦 Build Size Comparison\n\n## Summary\n\n| Metric | Value |\n|--------|-------|\n`;
+  let report = `## 📦 Build Size Comparison\n\n### Summary\n\n| Metric | Value |\n|--------|-------|\n`;
   report += `| Old Total Size | ${formatBytes(oldTotal)} |\n`;
   report += `| New Total Size | ${formatBytes(newTotal)} |\n`;
   report += `| Delta | ${formatBytes(totalDelta)} (${formatPercent(