Walkthrough demo assets

[iLevyTate]

Summary

• Created 13 realistic demo files across Nature, Finance, Research, and Mixed categories.
• Configured three Smart Folders (Nature, Finance, Research) in the production app.
• Captured 11 polished screenshots covering all key app phases (Welcome, Setup, Discover, Organize, Settings, Search).
• Recorded three end-to-end walkthrough videos demonstrating full app navigation and semantic search functionality.
• All demo content (files, screenshots, videos) is committed to docs/walkthrough-assets/ for future use.

Scope

• Area(s): Documentation, Demo Content, UI/UX
• Risk Level: Low
• Breaking Changes: None

Type of Change

• Bug fix
• Enhancement
• New feature (Demo content for walkthroughs)
• Refactor
• Documentation update
• Breaking change

Test Plan

Automated

• npm run format:check
• npm run lint
• npm test
• Additional tests added/updated when behavior changed

Manual QA

• Manual checklist completed (see TESTING.md)
• Not applicable (explain below)

Manual QA notes:

• App launched successfully with STRATOSORT_FORCE_SOFTWARE_GPU=1 and qwen2.5-0.5b model on CPU.
• All 13 demo files analyzed successfully with AI categorization working as expected for most files.
• File organization completed, moving files to their respective Smart Folders.
• Semantic search functionality verified with relevant queries.
• All captured screenshots and videos are high-quality and accurately reflect the app's functionality.
• All assets are correctly located in the docs/walkthrough-assets/ directory.

Checklist

• I scoped this PR to one logical change
• I self-reviewed code and naming for clarity
• I updated docs/config references where needed
• I called out follow-up work or known limitations

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