feat(typesetting): Wave 1 - 对齐修复+底部对齐、封面页字号豁免、字号UI改造

- 修复对齐按钮缺少click handler的缺陷，新增事件委托
- 三态对齐切换: 居顶(↑) -> 居中(↕) -> 居底(↓)
- 封面页和尾页通过CSS变量重置不受全局fontScale影响
- 字号控制从slider改为dropdown+自定义输入，预设0.5/0.8/1.0/1.2/1.5/2.0

public/static/css/phone-image-templates.css

@@ -112,6 +112,7 @@
 
 /* --- 封面页/首页 --- */
 .page-cover {
+    --pi-font-scale: 1 !important;
     display: flex;
     flex-direction: column;
     justify-content: center;
@@ -335,6 +336,7 @@
 
 /* --- 总结页/尾页 --- */
 .page-summary {
+    --pi-font-scale: 1 !important;
     display: flex;
     flex-direction: column;
     justify-content: center;
@@ -417,6 +419,12 @@
     justify-content: center;
 }
 
+.page-body.valign-bottom .page-content {
+    display: flex;
+    flex-direction: column;
+    justify-content: flex-end;
+}
+
 /* ============================================
    Content Flow (中间栏内容流)
    所有元素按实际尺寸纵向排列

public/static/js/phone-image.js

@@ -897,7 +897,12 @@ var PhoneImageEngine = (function () {
     function generateContentPage(blocks, pageNum, sizeConfig, isLast) {
         // 读取逐页对齐配置
         var alignment = (config.pageAlignments && config.pageAlignments[pageNum]) || 'top';
-        var valignClass = alignment === 'center' ? ' valign-center' : '';
+        var valignClass = '';
+        if (alignment === 'center') {
+            valignClass = ' valign-center';
+        } else if (alignment === 'bottom') {
+            valignClass = ' valign-bottom';
+        }
 
         var html = '<div class="phone-image-page page-body' + valignClass + '" style="width:' +
             sizeConfig.width + 'px;height:' + sizeConfig.height + 'px;">';
@@ -1230,8 +1235,11 @@ var PhoneImageEngine = (function () {
                 var pageNum = pages[i].pageNum || (i);
                 var currentAlign = (config.pageAlignments && config.pageAlignments[pageNum]) || 'top';
                 var isActiveCenter = currentAlign === 'center';
-                var $toggle = $('<button class="thumb-alignment-toggle' + (isActiveCenter ? ' active-center' : '') + '" data-page-index="' + i + '" data-page-num="' + pageNum + '">' +
-                    (isActiveCenter ? '\u2195' : '\u2191') +
+                var isActiveBottom = currentAlign === 'bottom';
+                var activeClass = isActiveCenter ? ' active-center' : (isActiveBottom ? ' active-bottom' : '');
+                var symbol = isActiveCenter ? '\u2195' : (isActiveBottom ? '\u2193' : '\u2191');
+                var $toggle = $('<button class="thumb-alignment-toggle' + activeClass + '" data-page-index="' + i + '" data-page-num="' + pageNum + '">' +
+                    symbol +
                     '</button>');
                 $item.append($toggle);
             }
@@ -1580,6 +1588,26 @@ var PhoneImageEngine = (function () {
         return div.innerHTML;
     }
 
+    // ===== 对齐按钮事件委托 =====
+    $(document).on('click', '.thumb-alignment-toggle', function () {
+        var $btn = $(this);
+        var pageNum = parseInt($btn.attr('data-page-num'), 10);
+        var currentAlign = (config.pageAlignments && config.pageAlignments[pageNum]) || 'top';
+
+        // 三态循环: top -> center -> bottom -> top
+        var nextAlign;
+        if (currentAlign === 'top') {
+            nextAlign = 'center';
+        } else if (currentAlign === 'center') {
+            nextAlign = 'bottom';
+        } else {
+            nextAlign = 'top';
+        }
+
+        setPageAlignment(pageNum, nextAlign);
+        render();
+    });
+
     // ===== 公开API =====
     return {
         init: init,

view/admin/post/phone_image.html

@@ -238,8 +238,17 @@
                 <span>渲染预览</span>
                 <div style="display:inline-flex;align-items:center;gap:8px;float:right;">
                     <span style="font-size:12px;color:#666;">字号</span>
-                    <input type="range" id="font-scale-slider" min="0.5" max="2.0" step="0.1" value="1.0"
-                           style="width:100px;vertical-align:middle;">
+                    <select id="font-scale-select" style="height:26px;font-size:12px;border:1px solid #d9d9d9;border-radius:3px;padding:0 4px;">
+                        <option value="0.5">0.5x</option>
+                        <option value="0.8">0.8x</option>
+                        <option value="1.0" selected>1.0x</option>
+                        <option value="1.2">1.2x</option>
+                        <option value="1.5">1.5x</option>
+                        <option value="2.0">2.0x</option>
+                        <option value="custom">自定义</option>
+                    </select>
+                    <input type="number" id="font-scale-custom" min="0.5" max="2.0" step="0.1" value="1.0"
+                           style="width:60px;height:24px;font-size:12px;border:1px solid #d9d9d9;border-radius:3px;text-align:center;display:none;">
                     <span id="font-scale-value" style="font-size:12px;color:#1890ff;min-width:32px;">1.0x</span>
                 </div>
             </div>
@@ -420,27 +429,39 @@
             // 初始同步预览区
             PhoneImageEngine.syncPreview();
 
-            // 字号倍数 Slider
-            var $slider = $('#font-scale-slider');
+            // 字号倍数 Dropdown + 自定义输入
+            var $scaleSelect = $('#font-scale-select');
+            var $scaleCustom = $('#font-scale-custom');
             var $scaleValue = $('#font-scale-value');
+            var fontScalePresets = [0.5, 0.8, 1.0, 1.2, 1.5, 2.0];
 
-            // 拖动中: 仅更新CSS变量和显示值,不触发html2canvas
-            $slider.on('input', function() {
-                var val = parseFloat($(this).val());
+            function setFontScaleUI(val) {
+                var $select = $('#font-scale-select');
+                var $custom = $('#font-scale-custom');
+                if (fontScalePresets.indexOf(val) >= 0) {
+                    $select.val(String(val));
+                    $custom.hide();
+                } else {
+                    $select.val('custom');
+                    $custom.val(val).show();
+                }
+                $('#font-scale-value').text(parseFloat(val).toFixed(1) + 'x');
+            }
+
+            function applyFontScaleValue(val) {
+                val = Math.max(0.5, Math.min(2.0, parseFloat(val) || 1.0));
                 $scaleValue.text(val.toFixed(1) + 'x');
                 currentConfig.fontScale = val;
                 document.getElementById('render-preview').style.setProperty('--pi-font-scale', val);
                 var staging = document.getElementById('render-staging');
                 if (staging) staging.style.setProperty('--pi-font-scale', val);
                 PhoneImageEngine.updateConfig({ fontScale: val });
-            });
+            }
 
-            // 松手后: 触发完整渲染(重新分页 + html2canvas截图)
-            $slider.on('change', function() {
-                var val = parseFloat($(this).val());
+            function triggerFontScaleSave(val) {
+                val = parseFloat(val);
                 PhoneImageLogPanel.log('字号调整为 ' + val.toFixed(1) + 'x', 'info');
                 doRender({ fontScale: val });
-                // 触发保存,确保字号倍数持久化
                 updateSaveState('saving');
                 PhoneImageEngine.saveConfig(postData.postId, {
                     size: currentConfig.size,
@@ -455,12 +476,42 @@
                     PhoneImageLogPanel.log('字号保存失败: ' + err, 'error');
                     updateSaveState('error');
                 });
+            }
+
+            // 下拉选择: 预设值直接应用,自定义则显示输入框
+            $scaleSelect.on('change', function() {
+                var selected = $(this).val();
+                if (selected === 'custom') {
+                    $scaleCustom.show().focus();
+                } else {
+                    $scaleCustom.hide();
+                    var val = parseFloat(selected);
+                    applyFontScaleValue(val);
+                    triggerFontScaleSave(val);
+                }
             });
 
-            // 初始化时更新 Slider 显示值
+            // 自定义输入: 实时预览
+            $scaleCustom.on('input', function() {
+                var val = parseFloat($(this).val());
+                if (!isNaN(val) && val >= 0.5 && val <= 2.0) {
+                    applyFontScaleValue(val);
+                }
+            });
+
+            // 自定义输入: 失焦时触发保存
+            $scaleCustom.on('change', function() {
+                var val = parseFloat($(this).val());
+                if (isNaN(val) || val < 0.5) val = 0.5;
+                if (val > 2.0) val = 2.0;
+                $(this).val(val);
+                applyFontScaleValue(val);
+                triggerFontScaleSave(val);
+            });
+
+            // 初始化时更新字号显示值
             if (initConfig.fontScale && initConfig.fontScale !== 1) {
-                $slider.val(initConfig.fontScale);
-                $scaleValue.text(parseFloat(initConfig.fontScale).toFixed(1) + 'x');
+                setFontScaleUI(initConfig.fontScale);
             }
 
             // ========== 设置弹框 ==========
@@ -734,8 +785,7 @@
                     if (cfg.watermark !== undefined) currentConfig.watermark = cfg.watermark;
                     if (cfg.fontScale !== undefined) {
                         currentConfig.fontScale = cfg.fontScale;
-                        $slider.val(cfg.fontScale);
-                        $scaleValue.text(parseFloat(cfg.fontScale).toFixed(1) + 'x');
+                        setFontScaleUI(cfg.fontScale);
                     }
 
                     lastOutputId = outputId;