refactor: extract shared escapeHtml utility from duplicated implementations

[mrveiss]

Context

Discovered during code review of PR #3183 (CodeQL fixes for #3164).

Problem

escapeHtml() is defined independently in two places with identical logic:

1. autobot-frontend/src/utils/cacheManagement.ts (added in PR fix(security): resolve ~14 JavaScript CodeQL alerts (#3164) #3183)
2. autobot-frontend/src/components/analytics/CodeGenerationDashboard.vue (existing)

This violates the CLAUDE.md rule: "Reuse Existing Code — import from autobot_shared/, never duplicate or hardcode."

Additionally, the cacheManagement.ts version is missing the single-quote (' → ') escape that the CodeGenerationDashboard.vue version includes.

Expected behavior

Extract a shared escapeHtml function to autobot-frontend/src/utils/sanitize.ts (which already has DOMPurify-based sanitization) or a new htmlHelpers.ts, and import it in both locations.

Files

• autobot-frontend/src/utils/cacheManagement.ts
• autobot-frontend/src/components/analytics/CodeGenerationDashboard.vue
• autobot-frontend/src/utils/sanitize.ts (candidate shared location)

Related

• PR fix(security): resolve ~14 JavaScript CodeQL alerts (#3164) #3183, issue Security: Fix remaining ~125 CodeQL alerts (path-injection, JS, ReDoS, SSRF, LDAP) #3164