fix: 确保侧边栏所有面板始终挂载以防止表单字段丢失

src/routes/admin/pages/[id]/+page.svelte

@@ -96,7 +96,8 @@
 				small={true}
 			/>
 
-			{#if sidebarTab === 'settings'}
+			<!-- 设置面板始终挂载（仅切换显隐），确保别名字段在提交时始终存在 -->
+			<div class="sidebar-panel" class:is-hidden={sidebarTab !== 'settings'}>
 				<div class="sidebar-box">
 					<h3>别名 *</h3>
 					<TextInput
@@ -109,12 +110,15 @@
 						variant="underline"
 					/>
 				</div>
-			{:else}
+			</div>
+
+			<!-- 媒体面板始终挂载（仅切换显隐），确保切换 Tab 时附件状态不丢失 -->
+			<div class="sidebar-panel" class:is-hidden={sidebarTab !== 'media'}>
 				<div class="sidebar-box">
 					<h3>当前页面附件</h3>
 					<ArticleAttachments bind:content bind:sessionUploads />
 				</div>
-			{/if}
+			</div>
 		</div>
 	</div>
 </form>
@@ -204,6 +208,16 @@
 		z-index: 10;
 	}
 
+	.sidebar-panel {
+		display: flex;
+		flex-direction: column;
+		gap: 30px;
+	}
+
+	.sidebar-panel.is-hidden {
+		display: none;
+	}
+
 	@media (max-width: 900px) {
 		.form-grid {
 			grid-template-columns: 1fr;

src/routes/admin/pages/new/+page.svelte

@@ -112,7 +112,8 @@
 				small={true}
 			/>
 
-			{#if sidebarTab === 'settings'}
+			<!-- 设置面板始终挂载（仅切换显隐），确保别名字段在提交时始终存在 -->
+			<div class="sidebar-panel" class:is-hidden={sidebarTab !== 'settings'}>
 				<div class="sidebar-box">
 					<h3 style="display: flex; justify-content: space-between; align-items: center;">
 						<span>别名 *</span>
@@ -136,12 +137,15 @@
 						variant="underline"
 					/>
 				</div>
-			{:else}
+			</div>
+
+			<!-- 媒体面板始终挂载（仅切换显隐），确保切换 Tab 时附件状态不丢失 -->
+			<div class="sidebar-panel" class:is-hidden={sidebarTab !== 'media'}>
 				<div class="sidebar-box">
 					<h3>当前页面附件</h3>
 					<ArticleAttachments bind:content bind:sessionUploads />
 				</div>
-			{/if}
+			</div>
 		</div>
 	</div>
 </form>
@@ -231,6 +235,16 @@
 		z-index: 10;
 	}
 
+	.sidebar-panel {
+		display: flex;
+		flex-direction: column;
+		gap: 30px;
+	}
+
+	.sidebar-panel.is-hidden {
+		display: none;
+	}
+
 	@media (max-width: 900px) {
 		.form-grid {
 			grid-template-columns: 1fr;

src/routes/admin/posts/[id]/+page.svelte

@@ -185,7 +185,8 @@
 				small={true}
 			/>
 
-			{#if sidebarTab === 'settings'}
+			<!-- 设置面板始终挂载（仅切换显隐），确保别名/分类/系列/标签等字段在提交时始终存在 -->
+			<div class="sidebar-panel" class:is-hidden={sidebarTab !== 'settings'}>
 				<div class="sidebar-box">
 					<h3>别名 *</h3>
 					<TextInput
@@ -303,7 +304,7 @@
 						{/if}
 					</div>
 				</div>
-			{/if}
+			</div>
 
 			<!-- 媒体面板始终挂载（仅切换显隐），确保特色图的隐藏表单项在表单提交时始终存在 -->
 			<div class="sidebar-panel" class:is-hidden={sidebarTab !== 'media'}>

src/routes/admin/posts/new/+page.svelte

@@ -205,7 +205,8 @@
 				small={true}
 			/>
 
-			{#if sidebarTab === 'settings'}
+			<!-- 设置面板始终挂载（仅切换显隐），确保别名/分类/系列/标签等字段在提交时始终存在 -->
+			<div class="sidebar-panel" class:is-hidden={sidebarTab !== 'settings'}>
 				<div class="sidebar-box">
 					<h3 style="display: flex; justify-content: space-between; align-items: center;">
 						<span>别名 *</span>
@@ -335,7 +336,7 @@
 						{/if}
 					</div>
 				</div>
-			{/if}
+			</div>
 
 			<!-- 媒体面板始终挂载（仅切换显隐），确保特色图的隐藏表单项在表单提交时始终存在 -->
 			<div class="sidebar-panel" class:is-hidden={sidebarTab !== 'media'}>