chore(standards): created local '.github/instructions/frontend.instructions.md' from remote '.github/instructions/frontend.instructions.md'

Synced AI-review standards from hallelx2/dev-standards.

Author: hallelx2

.github/instructions/frontend.instructions.md

@@ -0,0 +1,12 @@
+---
+applyTo: "**/*.ts,**/*.tsx,**/*.css"
+---
+
+TypeScript / Next.js review for this file. Cite `file:line` + the fix.
+
+- Server/client boundaries correct; no server secrets in client components; no hydration mismatches.
+- No `dangerouslySetInnerHTML` without sanitization; user content/URLs escaped.
+- No `any` smuggled past the types; exhaustive handling of unions.
+- Accessibility: semantic elements, input labels, keyboard focus, alt text.
+- Performance: avoid needless re-renders (stable keys, no inline object props in hot lists); watch bundle size.
+- Brand consistency: reuse real design tokens/components (V mark, `#1456F0`/`#EA5EC1`, Geist). Never invent a logo/color/font.