feat(reader): wire double-page spread setting into web reader

The double_page_spread checkbox in the reader settings panel was inert:
it had no Alpine binding, no apply logic, and no persistence. Default
was also inconsistent (false in settings-manager, absent from server
defaults).

- Add doublePageSpread state to the reader Alpine component, loaded
  from saved settings (default true)
- Add applyDoublePageSpread() which sets the renderer's 'spread'
  attribute to auto/none and persists the setting via saveSettings
- Apply the spread attribute during fixed-layout renderer init
- Bind the settings checkbox with x-model and @change
- Add double_page_spread: true to ReaderService server defaults so
  new users get the same starting value the client expects
- Also improve the PDF pan/select toolbar button: distinct smart-
  select vs pan icons, highlighted state while pan mode is active,
  and dynamic tooltips/aria-labels explaining each mode

internal/services/reader.go

@@ -403,6 +403,7 @@ func (s *ReaderService) getDefaultSettings() map[string]interface{} {
 		"tap_zone_size":      30,
 		"auto_scroll":        false,
 		"panel_zoom_enabled": true,
+		"double_page_spread": true,
 
 		// Dockable panel defaults
 		"panel_layout": map[string]interface{}{

templates/reader.templ

@@ -153,8 +153,13 @@ templ ReaderChrome(user User, metadata ReaderMetadata, progress ReadingProgress)
 							</svg>
 						</button>
 						<!-- Pan/Select mode (PDF only) -->
-						<button x-show="isPDF" @click="toggleInteractionMode()" class="p-1.5 sm:p-2 rounded-lg hover:bg-gray-700" title="Pan/Select Mode" aria-label="Toggle pan/select mode">
-							<svg class="reader-icon" width="20" height="20" aria-hidden="true">
+						<button x-show="isPDF" @click="toggleInteractionMode()" class="p-1.5 sm:p-2 rounded-lg hover:bg-gray-700" :class="interactionMode === 'pan' ? 'bg-blue-600 hover:bg-blue-700' : ''" :title="interactionMode === 'pan' ? 'Pan mode: drag anywhere to move. Click for Smart select.' : 'Smart select: drag text to select, drag blank to pan (Shift = force pan). Click for Pan mode.'" :aria-label="interactionMode === 'pan' ? 'Pan mode' : 'Smart select mode'">
+							<!-- Smart select (default): text cursor -->
+							<svg x-show="interactionMode !== 'pan'" class="reader-icon" width="20" height="20" aria-hidden="true">
+								<path d="M 10 3 L 10 17 M 7 5 L 10 4 L 13 5 M 7 15 L 10 16 L 13 15"></path>
+							</svg>
+							<!-- Force pan: move arrow -->
+							<svg x-show="interactionMode === 'pan'" class="reader-icon" width="20" height="20" aria-hidden="true">
 								<path d="M 5 3 v 12 M 5 15 l -2 2 M 5 15 l 2 2 M 5 3 l 3 3"></path>
 							</svg>
 						</button>
@@ -306,7 +311,7 @@ templ ReaderSettingsPanel() {
 			<div class="mb-6" x-show="isFixedLayout">
 				<h3 class="font-semibold mb-2">Navigation</h3>
 				<label class="flex items-center mb-2">
-					<input type="checkbox" name="double_page_spread" class="mr-2"/>
+					<input type="checkbox" name="double_page_spread" x-model="doublePageSpread" @change="applyDoublePageSpread()" class="mr-2"/>
 					Double Page Spread
 				</label>
 			</div>

templates/reader_templ.go

@@ -189,7 +189,7 @@ func ReaderChrome(user User, metadata ReaderMetadata, progress ReadingProgress)
 		if templ_7745c5c3_Err != nil {
 			return templ_7745c5c3_Err
 		}
-		templ_7745c5c3_Err = templruntime.WriteString(templ_7745c5c3_Buffer, 12, "</h1><button @click=\"toggleSettings()\" class=\"p-1.5 sm:p-2 rounded-lg hover:bg-gray-700\" title=\"Settings\">⚙️</button></div></div><!-- Bottom bar --><div id=\"reader-bottombar\" class=\"fixed bottom-0 left-0 right-0 bg-opacity-95 backdrop-blur border-t z-40 pb-[env(safe-area-inset-bottom)]\" style=\"background-color: var(--bg-primary);\"><div class=\"flex items-center px-1.5 py-1.5 gap-0.5 sm:px-2 sm:py-2 sm:gap-1\"><!-- Left navigation --><button @click=\"goLeft()\" class=\"p-1.5 sm:p-2 rounded-lg hover:bg-gray-700\" title=\"Go Left\" aria-label=\"Go left\"><svg class=\"reader-icon\" width=\"24\" height=\"24\" aria-hidden=\"true\"><path d=\"M 15 6 L 9 12 L 15 18\"></path></svg></button><!-- Progress slider --><input id=\"progress-slider\" type=\"range\" min=\"0\" max=\"1\" step=\"any\" list=\"tick-marks\" @input=\"goToFraction($event.target.value)\" class=\"grow\"> <datalist id=\"tick-marks\"></datalist><!-- Right navigation --><button @click=\"goRight()\" class=\"p-1.5 sm:p-2 rounded-lg hover:bg-gray-700\" title=\"Go Right\" aria-label=\"Go right\"><svg class=\"reader-icon\" width=\"24\" height=\"24\" aria-hidden=\"true\"><path d=\"M 9 6 L 15 12 L 9 18\"></path></svg></button><!-- Separator --><div class=\"w-px h-6 bg-gray-600 mx-1\"></div><!-- Zoom controls (fixed-layout only) --><template x-if=\"isFixedLayout\"><div class=\"flex items-center gap-1\"><!-- Zoom out --><button @click=\"zoomOut()\" class=\"p-1.5 sm:p-2 rounded-lg hover:bg-gray-700\" title=\"Zoom Out\" aria-label=\"Zoom out\"><svg class=\"reader-icon\" width=\"20\" height=\"20\" aria-hidden=\"true\"><path d=\"M 5 10 L 15 10\"></path></svg></button><!-- Zoom percentage --><button @click=\"resetZoom()\" class=\"text-xs px-1 rounded-lg hover:bg-gray-700 min-w-[3rem]\" title=\"Reset Zoom\" aria-label=\"Reset zoom\"><span x-text=\"zoomPercent + '%'\">100%</span></button><!-- Zoom in --><button @click=\"zoomIn()\" class=\"p-1.5 sm:p-2 rounded-lg hover:bg-gray-700\" title=\"Zoom In\" aria-label=\"Zoom in\"><svg class=\"reader-icon\" width=\"20\" height=\"20\" aria-hidden=\"true\"><path d=\"M 10 5 L 10 15 M 5 10 L 15 10\"></path></svg></button><!-- Magnifier --><button @click=\"toggleMagnifier()\" class=\"p-1.5 sm:p-2 rounded-lg hover:bg-gray-700\" title=\"Magnifier\" aria-label=\"Toggle magnifier\"><svg class=\"reader-icon\" width=\"20\" height=\"20\" aria-hidden=\"true\"><circle cx=\"9\" cy=\"9\" r=\"5\"></circle> <path d=\"M 13 13 L 18 18\"></path></svg></button><!-- Pan/Select mode (PDF only) --><button x-show=\"isPDF\" @click=\"toggleInteractionMode()\" class=\"p-1.5 sm:p-2 rounded-lg hover:bg-gray-700\" title=\"Pan/Select Mode\" aria-label=\"Toggle pan/select mode\"><svg class=\"reader-icon\" width=\"20\" height=\"20\" aria-hidden=\"true\"><path d=\"M 5 3 v 12 M 5 15 l -2 2 M 5 15 l 2 2 M 5 3 l 3 3\"></path></svg></button></div></template><!-- Separator --><div class=\"w-px h-6 bg-gray-600 mx-1\"></div><!-- Progress display --><div id=\"progress-display\" @click=\"cycleProgressMode()\" :title=\"progressTooltip()\" class=\"text-sm min-w-[4rem] max-w-[5rem] sm:max-w-none text-center cursor-pointer truncate whitespace-nowrap overflow-hidden\"><span class=\"hidden sm:inline\" x-text=\"progressLabel\"></span><span x-text=\"progressMain\">")
+		templ_7745c5c3_Err = templruntime.WriteString(templ_7745c5c3_Buffer, 12, "</h1><button @click=\"toggleSettings()\" class=\"p-1.5 sm:p-2 rounded-lg hover:bg-gray-700\" title=\"Settings\">⚙️</button></div></div><!-- Bottom bar --><div id=\"reader-bottombar\" class=\"fixed bottom-0 left-0 right-0 bg-opacity-95 backdrop-blur border-t z-40 pb-[env(safe-area-inset-bottom)]\" style=\"background-color: var(--bg-primary);\"><div class=\"flex items-center px-1.5 py-1.5 gap-0.5 sm:px-2 sm:py-2 sm:gap-1\"><!-- Left navigation --><button @click=\"goLeft()\" class=\"p-1.5 sm:p-2 rounded-lg hover:bg-gray-700\" title=\"Go Left\" aria-label=\"Go left\"><svg class=\"reader-icon\" width=\"24\" height=\"24\" aria-hidden=\"true\"><path d=\"M 15 6 L 9 12 L 15 18\"></path></svg></button><!-- Progress slider --><input id=\"progress-slider\" type=\"range\" min=\"0\" max=\"1\" step=\"any\" list=\"tick-marks\" @input=\"goToFraction($event.target.value)\" class=\"grow\"> <datalist id=\"tick-marks\"></datalist><!-- Right navigation --><button @click=\"goRight()\" class=\"p-1.5 sm:p-2 rounded-lg hover:bg-gray-700\" title=\"Go Right\" aria-label=\"Go right\"><svg class=\"reader-icon\" width=\"24\" height=\"24\" aria-hidden=\"true\"><path d=\"M 9 6 L 15 12 L 9 18\"></path></svg></button><!-- Separator --><div class=\"w-px h-6 bg-gray-600 mx-1\"></div><!-- Zoom controls (fixed-layout only) --><template x-if=\"isFixedLayout\"><div class=\"flex items-center gap-1\"><!-- Zoom out --><button @click=\"zoomOut()\" class=\"p-1.5 sm:p-2 rounded-lg hover:bg-gray-700\" title=\"Zoom Out\" aria-label=\"Zoom out\"><svg class=\"reader-icon\" width=\"20\" height=\"20\" aria-hidden=\"true\"><path d=\"M 5 10 L 15 10\"></path></svg></button><!-- Zoom percentage --><button @click=\"resetZoom()\" class=\"text-xs px-1 rounded-lg hover:bg-gray-700 min-w-[3rem]\" title=\"Reset Zoom\" aria-label=\"Reset zoom\"><span x-text=\"zoomPercent + '%'\">100%</span></button><!-- Zoom in --><button @click=\"zoomIn()\" class=\"p-1.5 sm:p-2 rounded-lg hover:bg-gray-700\" title=\"Zoom In\" aria-label=\"Zoom in\"><svg class=\"reader-icon\" width=\"20\" height=\"20\" aria-hidden=\"true\"><path d=\"M 10 5 L 10 15 M 5 10 L 15 10\"></path></svg></button><!-- Magnifier --><button @click=\"toggleMagnifier()\" class=\"p-1.5 sm:p-2 rounded-lg hover:bg-gray-700\" title=\"Magnifier\" aria-label=\"Toggle magnifier\"><svg class=\"reader-icon\" width=\"20\" height=\"20\" aria-hidden=\"true\"><circle cx=\"9\" cy=\"9\" r=\"5\"></circle> <path d=\"M 13 13 L 18 18\"></path></svg></button><!-- Pan/Select mode (PDF only) --><button x-show=\"isPDF\" @click=\"toggleInteractionMode()\" class=\"p-1.5 sm:p-2 rounded-lg hover:bg-gray-700\" :class=\"interactionMode === 'pan' ? 'bg-blue-600 hover:bg-blue-700' : ''\" :title=\"interactionMode === 'pan' ? 'Pan mode: drag anywhere to move. Click for Smart select.' : 'Smart select: drag text to select, drag blank to pan (Shift = force pan). Click for Pan mode.'\" :aria-label=\"interactionMode === 'pan' ? 'Pan mode' : 'Smart select mode'\"><!-- Smart select (default): text cursor --><svg x-show=\"interactionMode !== 'pan'\" class=\"reader-icon\" width=\"20\" height=\"20\" aria-hidden=\"true\"><path d=\"M 10 3 L 10 17 M 7 5 L 10 4 L 13 5 M 7 15 L 10 16 L 13 15\"></path></svg><!-- Force pan: move arrow --><svg x-show=\"interactionMode === 'pan'\" class=\"reader-icon\" width=\"20\" height=\"20\" aria-hidden=\"true\"><path d=\"M 5 3 v 12 M 5 15 l -2 2 M 5 15 l 2 2 M 5 3 l 3 3\"></path></svg></button></div></template><!-- Separator --><div class=\"w-px h-6 bg-gray-600 mx-1\"></div><!-- Progress display --><div id=\"progress-display\" @click=\"cycleProgressMode()\" :title=\"progressTooltip()\" class=\"text-sm min-w-[4rem] max-w-[5rem] sm:max-w-none text-center cursor-pointer truncate whitespace-nowrap overflow-hidden\"><span class=\"hidden sm:inline\" x-text=\"progressLabel\"></span><span x-text=\"progressMain\">")
 		if templ_7745c5c3_Err != nil {
 			return templ_7745c5c3_Err
 		}
@@ -198,7 +198,7 @@ func ReaderChrome(user User, metadata ReaderMetadata, progress ReadingProgress)
 				var templ_7745c5c3_Var7 string
 				templ_7745c5c3_Var7, templ_7745c5c3_Err = templ.JoinStringErrs(fmt.Sprintf("%.0f%% · Page %d/%d", progress.Percentage, progress.CurrentPage, metadata.EstimatedPages))
 				if templ_7745c5c3_Err != nil {
-					return templ.Error{Err: templ_7745c5c3_Err, FileName: `templates/reader.templ`, Line: 170, Col: 113}
+					return templ.Error{Err: templ_7745c5c3_Err, FileName: `templates/reader.templ`, Line: 175, Col: 113}
 				}
 				_, templ_7745c5c3_Err = templ_7745c5c3_Buffer.WriteString(templ.EscapeString(templ_7745c5c3_Var7))
 				if templ_7745c5c3_Err != nil {
@@ -208,7 +208,7 @@ func ReaderChrome(user User, metadata ReaderMetadata, progress ReadingProgress)
 				var templ_7745c5c3_Var8 string
 				templ_7745c5c3_Var8, templ_7745c5c3_Err = templ.JoinStringErrs(fmt.Sprintf("%.0f%%", progress.Percentage))
 				if templ_7745c5c3_Err != nil {
-					return templ.Error{Err: templ_7745c5c3_Err, FileName: `templates/reader.templ`, Line: 172, Col: 52}
+					return templ.Error{Err: templ_7745c5c3_Err, FileName: `templates/reader.templ`, Line: 177, Col: 52}
 				}
 				_, templ_7745c5c3_Err = templ_7745c5c3_Buffer.WriteString(templ.EscapeString(templ_7745c5c3_Var8))
 				if templ_7745c5c3_Err != nil {
@@ -219,7 +219,7 @@ func ReaderChrome(user User, metadata ReaderMetadata, progress ReadingProgress)
 			var templ_7745c5c3_Var9 string
 			templ_7745c5c3_Var9, templ_7745c5c3_Err = templ.JoinStringErrs(fmt.Sprintf("%d/%d", progress.CurrentPage, progress.TotalPages))
 			if templ_7745c5c3_Err != nil {
-				return templ.Error{Err: templ_7745c5c3_Err, FileName: `templates/reader.templ`, Line: 175, Col: 72}
+				return templ.Error{Err: templ_7745c5c3_Err, FileName: `templates/reader.templ`, Line: 180, Col: 72}
 			}
 			_, templ_7745c5c3_Err = templ_7745c5c3_Buffer.WriteString(templ.EscapeString(templ_7745c5c3_Var9))
 			if templ_7745c5c3_Err != nil {
@@ -255,7 +255,7 @@ func ReaderSettingsPanel() templ.Component {
 			templ_7745c5c3_Var10 = templ.NopComponent
 		}
 		ctx = templ.ClearChildren(ctx)
-		templ_7745c5c3_Err = templruntime.WriteString(templ_7745c5c3_Buffer, 14, "<div class=\"dockable-panel\" data-panel=\"settings\" data-side=\"left\" x-ref=\"settingsPanel\"><div class=\"panel-header flex items-center justify-between p-3 cursor-pointer\" @click=\"toggleWindowShade($refs.settingsPanel)\"><h3 class=\"panel-title font-semibold\">⚙️ Settings</h3><div class=\"panel-controls flex items-center gap-2\"><button class=\"window-shade-toggle\">─</button></div></div><div class=\"panel-content p-4 overflow-y-auto\"><!-- Display settings --><div class=\"mb-6\"><h3 class=\"font-semibold mb-2\">Display</h3><label class=\"block mb-2\">Chrome Behavior <select name=\"chrome_behavior\" class=\"w-full mt-1 px-3 py-2 rounded border\"><option value=\"auto-hide\">Auto Hide</option> <option value=\"always-visible\">Always Visible</option> <option value=\"hide-on-scroll\">Hide on Scroll</option></select></label> <label class=\"block mb-2\">Progress Mode <select name=\"progress_mode\" x-model=\"progressMode\" @change=\"applyProgressMode()\" class=\"w-full mt-1 px-3 py-2 rounded border\"><option value=\"pages\">Pages</option> <option value=\"chapter\">Chapter</option> <option value=\"percentage\">Percentage</option> <option value=\"time-left\">Time Left</option></select></label></div><!-- Reading Theme (reflowable only) --><div class=\"mb-6\" x-show=\"!isFixedLayout\"><div class=\"flex items-center justify-between mb-2\"><h3 class=\"font-semibold\">Reading Theme</h3><button @click=\"toggleReadingMode()\" class=\"relative w-14 h-7 rounded-full transition-colors duration-200 flex items-center px-1\" :class=\"readingMode === 'dark' ? 'bg-blue-500' : 'bg-gray-400'\" type=\"button\" :aria-label=\"readingMode === 'dark' ? 'Switch to light mode' : 'Switch to dark mode'\"><span class=\"absolute top-0.5 left-0.5 w-6 h-6 bg-white rounded-full shadow transition-transform duration-200 flex items-center justify-center text-xs\" :class=\"readingMode === 'dark' ? 'translate-x-7' : 'translate-x-0'\" x-text=\"readingMode === 'dark' ? '🌙' : '☀️'\">☀️</span></button></div><label class=\"block mb-2\"><select name=\"reading_theme\" x-model=\"readingTheme\" @change=\"applyTheme()\" class=\"w-full mt-1 px-3 py-2 rounded border\"><optgroup label=\"📖 Classic Reading\"><option value=\"light\">Light</option> <option value=\"paper\">Paper</option> <option value=\"sepia\">Sepia</option> <option value=\"parchment\">Parchment</option> <option value=\"warm\">Warm</option> <option value=\"candlelight\">Candlelight</option></optgroup> <optgroup label=\"🌤️ Sky & Atmosphere\"><option value=\"azure\">Azure</option> <option value=\"sky\">Sky</option> <option value=\"arctic\">Arctic</option> <option value=\"frost\">Frost</option></optgroup> <optgroup label=\"🌅 Sunset & Warmth\"><option value=\"dusk\">Dusk</option> <option value=\"sunset\">Sunset</option> <option value=\"twilight\">Twilight</option></optgroup> <optgroup label=\"🌲 Nature & Earth\"><option value=\"forest\">Forest</option> <option value=\"moss\">Moss</option> <option value=\"slate\">Slate</option></optgroup> <optgroup label=\"⚡ High Performance\"><option value=\"oled\">OLED</option> <option value=\"solarized\">Solarized</option></optgroup></select></label></div><!-- Typography (reflowable only) --><div class=\"mb-6\" x-show=\"!isFixedLayout\"><h3 class=\"font-semibold mb-2\">Typography</h3><label class=\"block mb-2\">Reading Font <select name=\"reading_font\" x-model=\"readingFont\" @change=\"applyFont()\" class=\"w-full mt-1 px-3 py-2 rounded border\"><option value=\"literata\">Literata (Default)</option> <option value=\"crimson\">Crimson Text</option> <option value=\"source-serif\">Source Serif 4</option> <option value=\"eb-garamond\">EB Garamond</option> <option value=\"libertinus\">Libertinus Serif</option> <option value=\"noto-serif\">Noto Serif</option> <option value=\"charis-sil\">Charis SIL</option> <option value=\"ibm-plex\">IBM Plex Serif</option></select></label> <label class=\"block mb-2\">Font Size <input type=\"range\" name=\"font_size\" x-model.number=\"fontSize\" @change=\"applyFont()\" min=\"10\" max=\"40\" class=\"w-full\"> <span class=\"text-xs\" x-text=\"fontSize + 'px'\" style=\"color: var(--text-secondary)\">18px</span></label> <label class=\"block mb-2\">Line Height <input type=\"range\" name=\"line_height\" x-model.number=\"lineHeight\" @change=\"applyFont()\" min=\"0.8\" max=\"3.0\" step=\"0.1\" class=\"w-full\"> <span class=\"text-xs\" x-text=\"lineHeight\" style=\"color: var(--text-secondary)\">1.6</span></label></div><!-- Navigation --><div class=\"mb-6\" x-show=\"isFixedLayout\"><h3 class=\"font-semibold mb-2\">Navigation</h3><label class=\"flex items-center mb-2\"><input type=\"checkbox\" name=\"double_page_spread\" class=\"mr-2\"> Double Page Spread</label></div><div class=\"flex gap-2 mt-6\"><button @click=\"restoreDefaults()\" class=\"flex-1 py-2 border rounded hover:opacity-80\" style=\"border-color: var(--border);\">Restore DefLine truncated
+		templ_7745c5c3_Err = templruntime.WriteString(templ_7745c5c3_Buffer, 14, "<div class=\"dockable-panel\" data-panel=\"settings\" data-side=\"left\" x-ref=\"settingsPanel\"><div class=\"panel-header flex items-center justify-between p-3 cursor-pointer\" @click=\"toggleWindowShade($refs.settingsPanel)\"><h3 class=\"panel-title font-semibold\">⚙️ Settings</h3><div class=\"panel-controls flex items-center gap-2\"><button class=\"window-shade-toggle\">─</button></div></div><div class=\"panel-content p-4 overflow-y-auto\"><!-- Display settings --><div class=\"mb-6\"><h3 class=\"font-semibold mb-2\">Display</h3><label class=\"block mb-2\">Chrome Behavior <select name=\"chrome_behavior\" class=\"w-full mt-1 px-3 py-2 rounded border\"><option value=\"auto-hide\">Auto Hide</option> <option value=\"always-visible\">Always Visible</option> <option value=\"hide-on-scroll\">Hide on Scroll</option></select></label> <label class=\"block mb-2\">Progress Mode <select name=\"progress_mode\" x-model=\"progressMode\" @change=\"applyProgressMode()\" class=\"w-full mt-1 px-3 py-2 rounded border\"><option value=\"pages\">Pages</option> <option value=\"chapter\">Chapter</option> <option value=\"percentage\">Percentage</option> <option value=\"time-left\">Time Left</option></select></label></div><!-- Reading Theme (reflowable only) --><div class=\"mb-6\" x-show=\"!isFixedLayout\"><div class=\"flex items-center justify-between mb-2\"><h3 class=\"font-semibold\">Reading Theme</h3><button @click=\"toggleReadingMode()\" class=\"relative w-14 h-7 rounded-full transition-colors duration-200 flex items-center px-1\" :class=\"readingMode === 'dark' ? 'bg-blue-500' : 'bg-gray-400'\" type=\"button\" :aria-label=\"readingMode === 'dark' ? 'Switch to light mode' : 'Switch to dark mode'\"><span class=\"absolute top-0.5 left-0.5 w-6 h-6 bg-white rounded-full shadow transition-transform duration-200 flex items-center justify-center text-xs\" :class=\"readingMode === 'dark' ? 'translate-x-7' : 'translate-x-0'\" x-text=\"readingMode === 'dark' ? '🌙' : '☀️'\">☀️</span></button></div><label class=\"block mb-2\"><select name=\"reading_theme\" x-model=\"readingTheme\" @change=\"applyTheme()\" class=\"w-full mt-1 px-3 py-2 rounded border\"><optgroup label=\"📖 Classic Reading\"><option value=\"light\">Light</option> <option value=\"paper\">Paper</option> <option value=\"sepia\">Sepia</option> <option value=\"parchment\">Parchment</option> <option value=\"warm\">Warm</option> <option value=\"candlelight\">Candlelight</option></optgroup> <optgroup label=\"🌤️ Sky & Atmosphere\"><option value=\"azure\">Azure</option> <option value=\"sky\">Sky</option> <option value=\"arctic\">Arctic</option> <option value=\"frost\">Frost</option></optgroup> <optgroup label=\"🌅 Sunset & Warmth\"><option value=\"dusk\">Dusk</option> <option value=\"sunset\">Sunset</option> <option value=\"twilight\">Twilight</option></optgroup> <optgroup label=\"🌲 Nature & Earth\"><option value=\"forest\">Forest</option> <option value=\"moss\">Moss</option> <option value=\"slate\">Slate</option></optgroup> <optgroup label=\"⚡ High Performance\"><option value=\"oled\">OLED</option> <option value=\"solarized\">Solarized</option></optgroup></select></label></div><!-- Typography (reflowable only) --><div class=\"mb-6\" x-show=\"!isFixedLayout\"><h3 class=\"font-semibold mb-2\">Typography</h3><label class=\"block mb-2\">Reading Font <select name=\"reading_font\" x-model=\"readingFont\" @change=\"applyFont()\" class=\"w-full mt-1 px-3 py-2 rounded border\"><option value=\"literata\">Literata (Default)</option> <option value=\"crimson\">Crimson Text</option> <option value=\"source-serif\">Source Serif 4</option> <option value=\"eb-garamond\">EB Garamond</option> <option value=\"libertinus\">Libertinus Serif</option> <option value=\"noto-serif\">Noto Serif</option> <option value=\"charis-sil\">Charis SIL</option> <option value=\"ibm-plex\">IBM Plex Serif</option></select></label> <label class=\"block mb-2\">Font Size <input type=\"range\" name=\"font_size\" x-model.number=\"fontSize\" @change=\"applyFont()\" min=\"10\" max=\"40\" class=\"w-full\"> <span class=\"text-xs\" x-text=\"fontSize + 'px'\" style=\"color: var(--text-secondary)\">18px</span></label> <label class=\"block mb-2\">Line Height <input type=\"range\" name=\"line_height\" x-model.number=\"lineHeight\" @change=\"applyFont()\" min=\"0.8\" max=\"3.0\" step=\"0.1\" class=\"w-full\"> <span class=\"text-xs\" x-text=\"lineHeight\" style=\"color: var(--text-secondary)\">1.6</span></label></div><!-- Navigation --><div class=\"mb-6\" x-show=\"isFixedLayout\"><h3 class=\"font-semibold mb-2\">Navigation</h3><label class=\"flex items-center mb-2\"><input type=\"checkbox\" name=\"double_page_spread\" x-model=\"doublePageSpread\" @change=\"applyDoublePageSpread()\" class=\"mr-2\"> Double Page Spread</label></div><div class=\"flex gap-2 mt-6\"><button @click=\"restoreDefaults()\" class=\"flex-1 py-2 border rounded hoveLine truncated
 		if templ_7745c5c3_Err != nil {
 			return templ_7745c5c3_Err
 		}
@@ -359,7 +359,7 @@ func ReaderBookmarksPanel(bookmarks []Bookmark) templ.Component {
 				var templ_7745c5c3_Var14 string
 				templ_7745c5c3_Var14, templ_7745c5c3_Err = templ.ResolveAttributeValue(bookmark.CfiPosition)
 				if templ_7745c5c3_Err != nil {
-					return templ.Error{Err: templ_7745c5c3_Err, FileName: `templates/reader.templ`, Line: 393, Col: 38}
+					return templ.Error{Err: templ_7745c5c3_Err, FileName: `templates/reader.templ`, Line: 398, Col: 38}
 				}
 				_, templ_7745c5c3_Err = templ_7745c5c3_Buffer.WriteString(templ_7745c5c3_Var14)
 				if templ_7745c5c3_Err != nil {
@@ -372,7 +372,7 @@ func ReaderBookmarksPanel(bookmarks []Bookmark) templ.Component {
 				var templ_7745c5c3_Var15 string
 				templ_7745c5c3_Var15, templ_7745c5c3_Err = templ.JoinStringErrs(bookmark.Title)
 				if templ_7745c5c3_Err != nil {
-					return templ.Error{Err: templ_7745c5c3_Err, FileName: `templates/reader.templ`, Line: 396, Col: 49}
+					return templ.Error{Err: templ_7745c5c3_Err, FileName: `templates/reader.templ`, Line: 401, Col: 49}
 				}
 				_, templ_7745c5c3_Err = templ_7745c5c3_Buffer.WriteString(templ.EscapeString(templ_7745c5c3_Var15))
 				if templ_7745c5c3_Err != nil {
@@ -385,7 +385,7 @@ func ReaderBookmarksPanel(bookmarks []Bookmark) templ.Component {
 				var templ_7745c5c3_Var16 string
 				templ_7745c5c3_Var16, templ_7745c5c3_Err = templ.JoinStringErrs(bookmark.Position)
 				if templ_7745c5c3_Err != nil {
-					return templ.Error{Err: templ_7745c5c3_Err, FileName: `templates/reader.templ`, Line: 398, Col: 27}
+					return templ.Error{Err: templ_7745c5c3_Err, FileName: `templates/reader.templ`, Line: 403, Col: 27}
 				}
 				_, templ_7745c5c3_Err = templ_7745c5c3_Buffer.WriteString(templ.EscapeString(templ_7745c5c3_Var16))
 				if templ_7745c5c3_Err != nil {

web/src/reader/reader.ts

@@ -371,6 +371,7 @@ document.addEventListener("alpine:init", () => {
     isPDF: false,
     interactionMode: "select" as string,
     magnifierEnabled: false,
+    doublePageSpread: true as boolean,
     progressText: "",
     progressLabel: "",
     progressMain: "",
@@ -454,6 +455,7 @@ document.addEventListener("alpine:init", () => {
         this.readingFont = this.settings.reading_font || "literata";
         this.fontSize = this.settings.font_size || 18;
         this.lineHeight = this.settings.line_height || 1.6;
+        this.doublePageSpread = this.settings.double_page_spread ?? true;
         if (this.settings.reading_mode) {
           this.readingMode = this.settings.reading_mode;
         } else {
@@ -492,6 +494,7 @@ document.addEventListener("alpine:init", () => {
           this.zoomPercent = this.renderer.zoomPercent;
         });
         this.computeFixedLayoutChapterBoundaries();
+        this.applyDoublePageSpread();
       } else {
         this.renderer.setStyles?.(this.buildCSS());
       }
@@ -692,6 +695,14 @@ document.addEventListener("alpine:init", () => {
       this.renderer.setAttribute("interaction-mode", next);
       this.interactionMode = next;
     },
+    applyDoublePageSpread() {
+      if (!this.isFixedLayout || !this.renderer) return;
+      this.renderer.setAttribute(
+        "spread",
+        this.doublePageSpread ? "auto" : "none",
+      );
+      saveSettings({ double_page_spread: this.doublePageSpread });
+    },
     goLeft() {
       this.view?.goLeft?.();
     },

web/src/reader/settings-manager.ts

@@ -78,7 +78,7 @@ export function getDefaultSettings(): ReaderSettings {
     font_size: 18,
     line_height: 1.6,
     margin_width: 20,
-    double_page_spread: false,
+    double_page_spread: true,
     reading_direction: "ltr",
     hardware_acceleration: true,
     panel_layout: {