feat(audio player): canonical audiobook transports + dropdown settings + volume panel

Transport row is now the five-button audiobook shape the user asked
for: previous-chapter · circular-skip-back (seconds displayed inside
the ring) · play/pause · circular-skip-forward · next-chapter — the
ring arrows are stroke SVGs (rotate-ccw/rotate-cw) with the number as
an overlay so it stays upright and follows the skip setting.

Settings strip collapses to four controls: Skip dropdown, Speed
dropdown, Bookmark (capture popover unchanged), Volume. Volume opens
a panel with a vertical dragger (writing-mode:rtl slider) and a
mute/unmute button; the strip icon is dynamic — 1–3 arcs by level (low
<34%, mid <67%, high) and crossed when muted or zero. Volume/mute
persist in localStorage and restore with the element; unmute floors
zero-volume to 50% so unmuting is audible.

Verified on-device: dropdowns open upward with current value
highlighted, mute flips both icons to the crossed state, slider
drag changes arc count, chapter buttons jump (pill → 15/34) and the
caption tracks the drawer's chapter labels.

templates/audio_reader_templ.go

@@ -172,7 +172,7 @@ func AudioReader(user User, metadata ReaderMetadata) templ.Component {
 		if templ_7745c5c3_Err != nil {
 			return templ_7745c5c3_Err
 		}
-		templ_7745c5c3_Err = templruntime.WriteString(templ_7745c5c3_Buffer, 13, "</h1><p class=\"text-sm mt-0.5 truncate\" style=\"color: var(--text-secondary);\" x-text=\"chapterTitle()\">—</p></div></div><!-- Scrubber + transports --><div class=\"w-full max-w-xl flex flex-col gap-2\"><div class=\"flex items-center gap-2 text-xs tabular-nums\" style=\"color: var(--text-secondary);\"><span x-text=\"fmtTime(currentTime)\">0:00</span> <input id=\"audio-scrub\" type=\"range\" min=\"0\" step=\"0.1\" :max=\"chaptersDuration() || 1\" :value=\"scrubbing ? scrubValue : currentTime\" class=\"flex-1 accent-current\" @input=\"scrubbing = true; scrubValue = Number($event.target.value)\" @pointerup=\"seekTo(scrubValue); scrubbing = false\" @change=\"seekTo(scrubValue); scrubbing = false\" style=\"z-index: 20;\"> <span x-text=\"fmtTime(chaptersDuration() || 1)\">0:00</span></div><div class=\"flex items-center justify-center gap-6\"><button type=\"button\" @click=\"skip(-1)\" class=\"rounded-full px-4 py-2.5 hover:bg-surface-hover transition-colors\" :aria-label=\"'Skip back ' + skipSeconds + 's'\" style=\"color: var(--text-primary);\"><span class=\"text-base font-semibold\">–<span x-text=\"skipSeconds\">10</span>s</span></button> <button id=\"audio-play\" type=\"button\" @click=\"togglePlay()\" class=\"rounded-full h-16 w-16 grid place-items-center\" style=\"background-color: var(--accent); color: var(--bg-primary);\" aria-label=\"Play or pause\"><span x-show=\"!playing\" class=\"text-3xl leading-none\">▶</span> <span x-show=\"playing\" class=\"text-3xl leading-none\" x-cloak>❚❚</span></button> <button type=\"button\" @click=\"skip(1)\" class=\"rounded-full px-4 py-2.5 hover:bg-surface-hover transition-colors\" :aria-label=\"'Skip forward ' + skipSeconds + 's'\" style=\"color: var(--text-primary);\"><span class=\"text-base font-semibold\">+<span x-text=\"skipSeconds\">10</span>s</span></button> <button type=\"button\" @click=\"toggleBookmarkCapture()\" class=\"rounded-full p-2.5 ml-2 hover:bg-surface-hover transition-colors\" :class=\"bookmarkCaptureOpen ? 'opacity-100' : 'opacity-60'\" aria-label=\"Add bookmark at current position\" title=\"Add bookmark\" style=\"color: var(--text-primary);\"><svg width=\"20\" height=\"20\" viewBox=\"0 0 24 24\" fill=\"none\" stroke=\"currentColor\" stroke-width=\"2\" stroke-linecap=\"round\" stroke-linejoin=\"round\" aria-hidden=\"true\"><path d=\"m19 21-7-4-7 4V5a2 2 0 0 1 2-2h10a2 2 0 0 1 2 2z\"></path> <path d=\"M12 7v6M9 10h6\"></path></svg></button></div></div><!-- Skip / Speed rows: one layout rule, labels left, chips right --><div class=\"w-full max-w-xl flex flex-col gap-2\"><div class=\"flex items-center justify-between\"><span class=\"text-xs uppercase tracking-wide\" style=\"color: var(--text-secondary);\">Skip</span><div class=\"flex items-center gap-1.5\"><template x-for=\"secs in [1, 5, 10, 15, 30]\" :key=\"'skip' + secs\"><button type=\"button\" @click=\"setSkip(secs)\" class=\"text-xs px-2.5 py-1.5 rounded-md transition-colors\" :class=\"Number(skipSeconds) === secs ? 'opacity-100 underline' : 'opacity-50 hover:opacity-80'\" style=\"color: var(--text-secondary);\" x-text=\"secs + 's'\"></button></template></div></div><div class=\"flex items-center justify-between\"><span class=\"text-xs uppercase tracking-wide\" style=\"color: var(--text-secondary);\">Speed</span><div class=\"flex items-center gap-1.5\"><template x-for=\"rate in [0.75, 1, 1.25, 1.5, 2]\" :key=\"rate\"><button type=\"button\" @click=\"setSpeed(rate)\" class=\"text-xs px-2.5 py-1.5 rounded-md transition-colors\" :class=\"Number(speed) === rate ? 'opacity-100 underline' : 'opacity-50 hover:opacity-80'\" style=\"color: var(--text-secondary);\" x-text=\"rate + '×'\"></button></template></div></div></div><!-- Chapter drawer: slides top-to-bottom, floats above the page\n\t\t\t     (backdrop overlay — the page never shifts) --><div x-show=\"chaptersOpen\" x-cloak class=\"fixed inset-0 z-40\" style=\"background-color: color-mix(in srgb, black 32%, transparent);\" @click=\"chaptersOpen = false\"></div><div x-show=\"chaptersOpen\" x-cloak x-transition:enter=\"transition ease-out duration-200\" x-transition:enter-start=\"-translate-y-4 opacity-0\" x-transition:enter-end=\"translate-y-0 opacity-100\" x-transition:leave=\"transition ease-in duration-150\" x-transition:leave-start=\"translate-y-0 opacity-100\" x-transition:leave-end=\"-translate-y-4 opacity-0\" class=\"fixed top-0 right-0 z-50 w-full sm:w-96 max-h-[70vh] overflow-y-auto rounded-b-2xl shadow-2xl p-3\" style=\"background-color: var(--bg-secondary); border: 1px solid var(--border); border-top-width: 0;\" @click.outside=\"chaptersOpen = false\"><div class=\"flex items-center justify-between mb-2 px-1\"><span class=\"text-sm font-semibold\" style=\"color: var(--text-primary);\">Chapters</span> <button type=\"button\" @click=\"chaptersOpen = false\" class=\"rounded-full p-1.5 hover:bg-surface-hover\" style=\"color: var(--text-secondary);\" aria-labLine truncated
+		templ_7745c5c3_Err = templruntime.WriteString(templ_7745c5c3_Buffer, 13, "</h1><p class=\"text-sm mt-0.5 truncate\" style=\"color: var(--text-secondary);\" x-text=\"chapterTitle()\">—</p></div></div><!-- Scrubber + transports --><div class=\"w-full max-w-xl flex flex-col gap-2\"><div class=\"flex items-center gap-2 text-xs tabular-nums\" style=\"color: var(--text-secondary);\"><span x-text=\"fmtTime(currentTime)\">0:00</span> <input id=\"audio-scrub\" type=\"range\" min=\"0\" step=\"0.1\" :max=\"chaptersDuration() || 1\" :value=\"scrubbing ? scrubValue : currentTime\" class=\"flex-1 accent-current\" @input=\"scrubbing = true; scrubValue = Number($event.target.value)\" @pointerup=\"seekTo(scrubValue); scrubbing = false\" @change=\"seekTo(scrubValue); scrubbing = false\" style=\"z-index: 20;\"> <span x-text=\"fmtTime(chaptersDuration() || 1)\">0:00</span></div><div class=\"flex items-center justify-center gap-3 md:gap-5\"><button type=\"button\" @click=\"stepChapter(-1)\" class=\"rounded-full p-2.5 hover:bg-surface-hover transition-colors\" aria-label=\"Previous chapter\" title=\"Previous chapter\" style=\"color: var(--text-primary);\"><svg width=\"22\" height=\"22\" viewBox=\"0 0 24 24\" fill=\"none\" stroke=\"currentColor\" stroke-width=\"1.75\" stroke-linecap=\"round\" stroke-linejoin=\"round\" aria-hidden=\"true\"><path d=\"M19 20 9 12l10-8v16z\"></path> <path d=\"M5 19V5\"></path></svg></button> <button type=\"button\" @click=\"skip(-1)\" class=\"relative rounded-full h-14 w-14 grid place-items-center hover:bg-surface-hover transition-colors\" :aria-label=\"'Skip back ' + skipSeconds + 's'\" :title=\"'Skip back ' + skipSeconds + 's'\" style=\"color: var(--text-primary);\"><svg width=\"52\" height=\"52\" viewBox=\"0 0 24 24\" fill=\"none\" stroke=\"currentColor\" stroke-width=\"1.5\" stroke-linecap=\"round\" stroke-linejoin=\"round\" aria-hidden=\"true\"><path d=\"M3 12a9 9 0 1 0 9-9 9.75 9.75 0 0 0-6.74 2.74L3 8\"></path> <path d=\"M3 3v5h5\"></path></svg> <span class=\"absolute inset-0 grid place-items-center text-[11px] font-semibold pointer-events-none\"><span x-text=\"skipSeconds\">10</span></span></button> <button id=\"audio-play\" type=\"button\" @click=\"togglePlay()\" class=\"rounded-full h-16 w-16 grid place-items-center\" style=\"background-color: var(--accent); color: var(--bg-primary);\" aria-label=\"Play or pause\"><span x-show=\"!playing\" class=\"text-3xl leading-none\">▶</span> <span x-show=\"playing\" class=\"text-3xl leading-none\" x-cloak>❚❚</span></button> <button type=\"button\" @click=\"skip(1)\" class=\"relative rounded-full h-14 w-14 grid place-items-center hover:bg-surface-hover transition-colors\" :aria-label=\"'Skip forward ' + skipSeconds + 's'\" :title=\"'Skip forward ' + skipSeconds + 's'\" style=\"color: var(--text-primary);\"><svg width=\"52\" height=\"52\" viewBox=\"0 0 24 24\" fill=\"none\" stroke=\"currentColor\" stroke-width=\"1.5\" stroke-linecap=\"round\" stroke-linejoin=\"round\" aria-hidden=\"true\"><path d=\"M21 12a9 9 0 1 1-9-9c2.52 0 4.93 1 6.74 2.74L21 8\"></path> <path d=\"M21 3v5h-5\"></path></svg> <span class=\"absolute inset-0 grid place-items-center text-[11px] font-semibold pointer-events-none\"><span x-text=\"skipSeconds\">10</span></span></button> <button type=\"button\" @click=\"stepChapter(1)\" class=\"rounded-full p-2.5 hover:bg-surface-hover transition-colors\" aria-label=\"Next chapter\" title=\"Next chapter\" style=\"color: var(--text-primary);\"><svg width=\"22\" height=\"22\" viewBox=\"0 0 24 24\" fill=\"none\" stroke=\"currentColor\" stroke-width=\"1.75\" stroke-linecap=\"round\" stroke-linejoin=\"round\" aria-hidden=\"true\"><path d=\"M5 4l10 8-10 8V4z\"></path> <path d=\"M19 5v14\"></path></svg></button></div></div><!-- Settings strip: Skip ▾ · Speed ▾ · Bookmark · Volume ▾ --><div class=\"w-full max-w-xl flex items-center justify-center gap-2\"><div class=\"relative\" @click.outside=\"skipOpen = false\"><button type=\"button\" @click=\"skipOpen = !skipOpen\" class=\"text-xs px-3 py-2 rounded-lg hover:bg-surface-hover transition-colors inline-flex items-center gap-1.5\" :aria-label=\"'Skip duration, currently ' + skipSeconds + ' seconds'\" style=\"color: var(--text-secondary);\"><span>Skip</span> <span class=\"font-semibold\" style=\"color: var(--text-primary);\" x-text=\"skipSeconds + 's'\">10s</span> <svg width=\"12\" height=\"12\" viewBox=\"0 0 24 24\" fill=\"none\" stroke=\"currentColor\" stroke-width=\"2\" stroke-linecap=\"round\" stroke-linejoin=\"round\" aria-hidden=\"true\"><path d=\"m6 9 6 6 6-6\"></path></svg></button><div x-show=\"skipOpen\" x-cloak class=\"absolute bottom-full mb-2 left-1/2 -translate-x-1/2 rounded-xl shadow-lg p-1.5 flex flex-col min-w-[7.5rem]\" style=\"background-color: var(--bg-secondary); border: 1px solid var(--border); z-index: 30;\"><template x-for=\"secs in [1, 5, 10, 15, 30]\" :key=\"'skip' + secs\"><button type=\"button\" @click=\"setSkip(secs); skipOpen = false\" class=\"w-full textLine truncated
 		if templ_7745c5c3_Err != nil {
 			return templ_7745c5c3_Err
 		}