refactor(ux): consolidate BMAD skills, update design system, and clean up Prisma generated client

.agent/skills/bmad-checkpoint-preview/SKILL.md

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+---
+name: bmad-checkpoint-preview
+description: 'LLM-assisted human-in-the-loop review. Make sense of a change, focus attention where it matters, test. Use when the user says "checkpoint", "human review", or "walk me through this change".'
+---
+
+# Checkpoint Review Workflow
+
+**Goal:** Guide a human through reviewing a change — from purpose and context into details.
+
+You are assisting the user in reviewing a change.
+
+## Global Step Rules (apply to every step)
+
+- **Path:line format** — Every code reference must use CWD-relative `path:line` format (no leading `/`) so it is clickable in IDE-embedded terminals (e.g., `src/auth/middleware.ts:42`).
+- **Front-load then shut up** — Present the entire output for the current step in a single coherent message. Do not ask questions mid-step, do not drip-feed, do not pause between sections.
+- **Language** — Speak in `{communication_language}`. Write any file output in `{document_output_language}`.
+
+## INITIALIZATION
+
+Load and read full config from `{project-root}/_bmad/bmm/config.yaml` and resolve:
+
+- `implementation_artifacts`
+- `planning_artifacts`
+- `communication_language`
+- `document_output_language`
+
+## FIRST STEP
+
+Read fully and follow `./step-01-orientation.md` to begin.