feat(interface-design): add comprehensive interface design skill documentation and references

- Introduced SKILL.md outlining the principles and processes for effective interface design.
- Added critique.md for evaluating design outputs and ensuring craft over correctness.
- Created example.md to illustrate the application of subtle layering principles in design decisions.
- Developed principles.md detailing core craft principles for consistent design quality.
- Implemented validation.md for memory management and pattern reuse in the design system.
- Established system.md for the Playzer design system, defining direction, domain concepts, and design decisions.
- Added StatusBadge component for displaying booking statuses with appropriate styles and labels.
- Updated skills-lock.json to include the new interface-design skill.

skills-lock.json

@@ -0,0 +1,10 @@
+{
+  "version": 1,
+  "skills": {
+    "interface-design": {
+      "source": "dammyjay93/interface-design",
+      "sourceType": "github",
+      "computedHash": "d004c5e5e2e7132e1d64e9c2a339db7f7aaa69053a5c19cddc210dd35dd6fff5"
+    }
+  }
+}