fix: explicitly enable native OS drag-drop on main window

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fix: tauri.conf.json - update product name to Refstudio, version to 1.0.0-alpha

Use fresh SQLite db name to avoid modified migration dev panic

Revise browser UI layout and add Phase 2 shield foundation

Add required Tauri icon assets

Fix Tauri v2.11 config and Deno dev commands

Phase 0 MUSE alpha skeleton and SRS docs