b87e758303
When autoNext is enabled, audio automatically advances to the next chapter when a track ends — navigating the page and starting the new chapter's audio. - audioStore: add autoNext (toggle flag), nextChapter (written by AudioPlayer), and autoStartPending (set before goto, cleared after auto-start fires) - layout: update onended to call goto() and set autoStartPending when autoNext is on and nextChapter is available; add auto-next toggle button to mini-player bar (double-chevron icon, amber when active) - AudioPlayer: accept nextChapter prop; write it to audioStore via $effect; auto-start playback when autoStartPending is set on component mount; show inline 'Auto' toggle button in ready controls when a next chapter exists - Chapter page: pass data.next as nextChapter prop to AudioPlayer