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Add CJK phonetic features, per-pair profile settings, and pinyin keyboard.
Implement language pair support for cards, catalog, scenarios, and learning (G2–G5).
Add G11 courses, lessons, and learning flow.
[TEME]
Add scenario builder dialog UI and language pair profile (G0–G1).
Add learning home dashboard and fix course picker freeze.
Show all enabled phonetic systems and seed ru→zh demo cards.
Scale scenario builder with HTTP API, snapshot mode, and multi-user UI.
Scope tools UI to the active language pair (G8).