fix: make code generator produce video-specific output instead of identical boilerplate

[Copilot]

All generated projects were byte-for-byte identical because _generate_vanilla_main_js() silently discarded its tutorial_steps and features parameters, returning the same hardcoded string every time. Two additional title extractions were also discarded (result not assigned), and _generate_repo_name() always fell through to "uvai-project".

Changes

code_generator.py

• _generate_vanilla_main_js(): now embeds extracted tutorial_steps as a real JS array and generates named initXxx() stubs for each feature in features
• AI path wired in: generate_project() delegates to AICodeGenerator.generate_fullstack_project() when GEMINI_API_KEY is present and the SDK is importable; falls back to templates on any failure
• Discarded assignments fixed: _generate_web_project() and _generate_api_project() both called .get("title", ...) but threw the result away — now assigned

# Before — identical output regardless of input
def _generate_vanilla_main_js(self, tutorial_steps, features):
    return '''// UVAI Generated JavaScript\ndocument.addEventListener(...)...'''

# After — embeds actual video content
def _generate_vanilla_main_js(self, tutorial_steps, features):
    entries = ", ".join([f'"{step[:80]}"' for step in tutorial_steps[:8]])
    step_logs = f"const tutorialSteps = [{entries}];\n    tutorialSteps.forEach(..."
    # + per-feature initXxx() stubs

deployment_manager.py

• _generate_repo_name(): checks project_config["title"] and project_config["video_title"] before falling back to "uvai-project", so repos get names derived from the video

tests/test_code_generator.py

• Added test_vanilla_main_js_includes_tutorial_steps_and_features
• Added test_two_different_videos_produce_different_code
• Added test_generate_repo_name_uses_video_title

Original prompt

---

This section details on the original issue you should resolve

<issue_title>🔴 code_generator.py falls back to identical vanilla template for every video</issue_title>
<issue_description>## Problem
All 11 uvai-generated-project-* repos contain byte-for-byte identical output. The ProjectCodeGenerator._generate_vanilla_js_project() ignores the extracted tutorial_steps, technologies, and features from the video analysis and generates the same boilerplate every time.

Root Cause

In src/youtube_extension/backend/code_generator.py:

• _generate_vanilla_main_js() returns a hardcoded string with generic messages regardless of input
• _generate_vanilla_index_html() lists 'Responsive Design' and 'Modern Ui' for every project
• The title defaults to 'UVAI Web App' / 'UVAI Generated Project' because extracted_info title is not being passed through

Evidence

• 11 repos created March 1-2, 2026 — all identical (verified via MD5 hash comparison)
• _generate_repo_name() sanitizes the default title to uvai-generated-project every time
• The 172KB ai_code_generator.py exists but is not wired into the vanilla JS path

Fix Required

1. Wire ai_code_generator.py into ALL code generation paths
2. Pass tutorial_steps into actual generated code — each video should produce unique output
3. Use extracted technologies to select the right framework instead of always falling back to vanilla
4. Generate meaningful title from video analysis, not a generic fallback

Acceptance Criteria

• Process two different videos → get meaningfully different code
• No more uvai-generated-project-XXXX naming — use video-derived names

References

• Architecture Stage 3: Polymorphic Output Synthesis
• Files: src/youtube_extension/backend/code_generator.py, ai_code_generator.py</issue_description>

Comments on the Issue (you are @copilot in this section)

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• Fixes 🔴 code_generator.py falls back to identical vanilla template for every video #83

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Project	Deployment	Actions	Updated (UTC)
v0-uvai	Ready	Preview, Comment, Open in v0	Mar 20, 2026 10:46am

[groupthinking]

Closing: superseded by PR #113 which ported the UUID suffix fix + _build_title helper from YOUTUBE-EXTENSION PR #706. The root cause (timestamp % 10000 collision + generic fallback title) is fixed.