feat(app): track-header toggles, effect library, panel titles (design parity)
- track headers: name + visible/mute/lock toggles, undoable through graphops, honored by the montage (muted tracks are skipped) and by the edit guards (locked tracks reject trims/moves/deletes) - project explorer gains a panel title row; the tree/icons toggle is now small icon buttons with tooltips - new effect library dock panel (every addable effect; double-click appends to the selected clip's chain) - screenshots refreshed (zh/en, window/manager/preferences)
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