fix(status-pages): import escapeHtml from @maple/strings in markdown.ts - #2468

🟢 Confidence 10/10 · safe to merge. Import-only fix; escapeHtml resolves from @maple/strings, a declared dependency that escape.ts already imports from.
_{no findings · tests covered · risk low}

Restores main's status-page build by importing escapeHtml from @maple/strings, where #1438 moved it, instead of the now-deleted re-export in ./escape. Safe to merge.

• markdown.ts imports escapeHtml from @maple/strings; ./escape keeps safeUrl

_{4893b3f · Reply "won't fix" to dismiss a finding, or mention @maple-review-bot to ask about one.}