fix: ChatBubble crash and DeepSeek API compatibility

- Fix ChatBubble to handle non-string content with String() wrapper
- Fix API route to use generateText for non-streaming requests
- Add @ai-sdk/openai-compatible for non-OpenAI providers (DeepSeek, etc.)
- Use Chat Completions API instead of Responses API for compatible providers
- Update ChatBubble tests and fix component exports to kebab-case
- Remove stale PascalCase ChatBubble.tsx file

_bmad/core/resources/excalidraw/validate-json-instructions.md

@@ -0,0 +1,79 @@
+# JSON Validation Instructions
+
+## Purpose
+
+Validate Excalidraw JSON files after saving to catch syntax errors (missing commas, brackets, quotes).
+
+## How to Validate
+
+Use Node.js built-in JSON parsing to validate the file:
+
+```bash
+node -e "JSON.parse(require('fs').readFileSync('FILE_PATH', 'utf8')); console.log('✓ Valid JSON')"
+```
+
+Replace `FILE_PATH` with the actual file path.
+
+## Exit Codes
+
+- Exit code 0 = Valid JSON
+- Exit code 1 = Invalid JSON (syntax error)
+
+## Error Output
+
+If invalid, Node.js will output:
+
+- Error message with description
+- Position in file where error occurred
+- Line and column information (if available)
+
+## Common Errors and Fixes
+
+### Missing Comma
+
+```
+SyntaxError: Expected ',' or '}' after property value
+```
+
+**Fix:** Add comma after the property value
+
+### Missing Bracket/Brace
+
+```
+SyntaxError: Unexpected end of JSON input
+```
+
+**Fix:** Add missing closing bracket `]` or brace `}`
+
+### Extra Comma (Trailing)
+
+```
+SyntaxError: Unexpected token ,
+```
+
+**Fix:** Remove the trailing comma before `]` or `}`
+
+### Missing Quote
+
+```
+SyntaxError: Unexpected token
+```
+
+**Fix:** Add missing quote around string value
+
+## Workflow Integration
+
+After saving an Excalidraw file, run validation:
+
+1. Save the file
+2. Run: `node -e "JSON.parse(require('fs').readFileSync('{{save_location}}', 'utf8')); console.log('✓ Valid JSON')"`
+3. If validation fails:
+   - Read the error message for line/position
+   - Open the file at that location
+   - Fix the syntax error
+   - Save and re-validate
+4. Repeat until validation passes
+
+## Critical Rule
+
+**NEVER delete the file due to validation errors - always fix the syntax error at the reported location.**