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/bmm/workflows/4-implementation/create-story/template.md

@@ -0,0 +1,49 @@
+# Story {{epic_num}}.{{story_num}}: {{story_title}}
+
+Status: ready-for-dev
+
+<!-- Note: Validation is optional. Run validate-create-story for quality check before dev-story. -->
+
+## Story
+
+As a {{role}},
+I want {{action}},
+so that {{benefit}}.
+
+## Acceptance Criteria
+
+1. [Add acceptance criteria from epics/PRD]
+
+## Tasks / Subtasks
+
+- [ ] Task 1 (AC: #)
+  - [ ] Subtask 1.1
+- [ ] Task 2 (AC: #)
+  - [ ] Subtask 2.1
+
+## Dev Notes
+
+- Relevant architecture patterns and constraints
+- Source tree components to touch
+- Testing standards summary
+
+### Project Structure Notes
+
+- Alignment with unified project structure (paths, modules, naming)
+- Detected conflicts or variances (with rationale)
+
+### References
+
+- Cite all technical details with source paths and sections, e.g. [Source: docs/<file>.md#Section]
+
+## Dev Agent Record
+
+### Agent Model Used
+
+{{agent_model_name_version}}
+
+### Debug Log References
+
+### Completion Notes List
+
+### File List