dev(docs,cursor): add rule for running docs tests (#36150)

Add a rule so Cursor can figure out how to properly run docs tests.

.cursor/rules/docs-test-requirements.mdc

@@ -0,0 +1,71 @@
+---
+description: Docs Testing Procedure
+globs: apps/docs/**/*.test.ts
+alwaysApply: false
+---
+
+# Docs Test Requirements
+
+Rules for running tests in the docs application, ensuring proper Supabase setup and test execution.
+
+<rule>
+name: docs_test_requirements
+description: Standards for running tests in the docs application with proper Supabase setup
+filters:
+  # Match test files in the docs app
+  - type: file_extension
+    pattern: "\\.(test|spec)\\.(ts|tsx)$"
+  - type: path
+    pattern: "^apps/docs/.*"
+  # Match test execution events
+  - type: event
+    pattern: "test_execution"
+
+actions:
+  - type: suggest
+    message: |
+      Before running tests in the docs app:
+
+      1. Check Supabase status:
+         ```bash
+         pnpm supabase status
+         ```
+
+      2. If Supabase is not running:
+         ```bash
+         pnpm supabase start
+         ```
+
+      3. Reset the database to ensure clean state:
+         ```bash
+         pnpm supabase db reset --local
+         ```
+
+      4. Run the tests:
+         ```bash
+         pnpm run -F docs test:local:unwatch
+         ```
+
+      Important notes:
+      - Always ensure Supabase is running before tests
+      - Database must be reset to ensure clean state
+      - Use test:local:unwatch to run tests without watch mode
+      - Tests are located in apps/docs/**/*.{test,spec}.{ts,tsx}
+
+examples:
+  - input: |
+      # Bad: Running tests without proper setup
+      pnpm run -F docs test
+      pnpm run -F docs test:local
+
+      # Good: Proper test execution sequence
+      pnpm supabase status
+      pnpm supabase start  # if not running
+      pnpm supabase db reset --local
+      pnpm run -F docs test:local:unwatch
+    output: "Correctly executed docs tests with proper Supabase setup"
+
+metadata:
+  priority: high
+  version: 1.0
+</rule>