chore(frontend): fix ESLint, add Pint+ESLint pre-commit hook, centralize v-html

Fix the broken ESLint setup: add vue-eslint-parser and @typescript-eslint/parser
and wire the TS parser into eslint.config.mjs so .ts and <script lang=ts> parse
(was failing outright). Clear the resulting backlog to a clean 0/0 baseline —
fix genuine issues, relax two intentional-pattern rules (multi-word-component-names,
no-required-prop-with-default).

Add a committed .githooks/pre-commit (enabled via core.hooksPath, auto-set by the
prepare script) that runs Pint on staged PHP and ESLint --max-warnings 0 on staged
resources/scripts JS/TS/Vue, blocking on failure. Add composer/npm lint scripts and
document the gate in CLAUDE.md.

Replace every scattered v-html with a single audited BaseSanitizedHtml component
that DOMPurify-sanitizes its input (new utils/markdown.ts sanitizeHtml), so
server/registry-provided HTML is actually sanitized and vue/no-v-html stays enabled
everywhere but one reviewed sink.

resources/scripts/components/table/DataTable.vue

@@ -132,7 +132,7 @@
           <TablePagination
             v-if="pagination"
             :pagination="pagination"
-            @pageChange="pageChange"
+            @page-change="pageChange"
           />
         </div>
       </div>