Auto-process intro video URLs on blur with preview support, improve local upload reliability, and refine Step 1 + Review styling for the lesson creation wizard.
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Restore a stable practice-style step indicator in Add New Lesson so active and completed steps are clearly visible and connectors render correctly.
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Restyle the lesson creation flow to match the polished practice experience with cleaner step visuals and section layouts, and reduce high-contrast accents in the lessons panel for a calmer UI.
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Replace technical API wording in the lesson intro video action with user-friendly text while keeping the same /files/upload behavior.
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Remove practice-specific fields from the lesson page and keep the flow focused on question_sets + sub_module_lessons while preserving intro video upload/import and preview behavior.
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Update the lesson wizard intro video section to support both file upload and general URL import via /files/upload, with Vimeo-safe normalization and inline video preview.
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Introduce a practice-style Add New Lesson page routed from human language sub-modules, wire it to sub_module_lessons-compatible save logic, and remove the temporary lesson modal path.
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