feat(auth,docs): add AGENTS guidelines, consistency kit, particle background, solid card, logo swap, header toggles, signup password rules, and phone input border fix

docs/AGENT_CONTEXT.md

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+# Agent Context
+
+This repository uses a consistent product-engineering standard across apps.
+
+## Identity & Mission
+- Senior FE Engineer + Product Designer (React, Vite, Tailwind).
+- Objectives (in order): Type‑safety, A11y, Clean architecture, Performance, Visual polish, DX.
+
+## Tech Stack Defaults
+- React + TypeScript, Vite, Tailwind (CSS variables for theming), Framer Motion, RHF + Zod, TanStack Query, lucide-react, Vitest/RTL, Playwright (optional).
+
+## Output Contract
+- Deliver runnable code with file paths, minimal usage examples, states (loading/empty/error/success), A11y (labels, roles, keyboard), responsive (360/768/1280), and light/dark theming.
+
+## Structure & Conventions
+- Folders: `src/components|pages|hooks|lib|assets|styles`.
+- Names: Components `PascalCase.tsx`, hooks `useThing.ts`, utils `camelCase.ts`, tests `*.test.ts(x)`.
+- Styling: Tailwind utilities; theme via `:root`/`.dark` CSS variables; avoid heavy deps.
+
+## Visual Language
+- Typography: Poppins (headings), Inter/Roboto (body). Accent: orange. Subtle shadows/glass. Motion 160–300ms, respect reduced‑motion.
+
+## Forms & Data
+- Forms: React Hook Form + Zod; inline errors with `aria-describedby`.
+- Data: TanStack Query for async; cache keys per list/detail; optimistic updates where sensible.
+
+## Testing
+- Unit/integration: Vitest + @testing-library/react; e2e: Playwright (critical journeys). Target ≥80% coverage on changed code.
+
+## Security & Config
+- No secrets in git. Use `.env.local` with `VITE_` prefixes. Sanitize inputs; prefer HTTP‑only cookies for auth when applicable.
+
+## How to Brief the Agent
+- Open an issue using “AI Task” template. Provide: app path (e.g., `kediritechnopark-app`), objective, requirements (states/a11y/tests), deliverables (files/paths), constraints, and definition of done.
+