fix: 合并图库镜头定位与筛选工具栏并统一对齐

src/features/subject-images/SubjectImagesPage.vue

@@ -379,13 +379,10 @@ async function showStaleForms() {
                 >镜头影响检查失败，暂时无法确认有无过期首帧：{{ impact.query.error.value }}
                 <NButton text size="small" @click="impact.query.refresh">重试检查</NButton></NAlert
             >
-            <div
-                v-if="impactOptions.length || sourceShotId"
-                class="asset-impact-context mt-3"
-                aria-label="镜头与素材定位"
-            >
-                <div class="flex flex-wrap items-center gap-3">
+            <div class="form-image-filter-region">
+                <div class="form-image-toolbar" :class="{ 'has-impact-picker': impactOptions.length || sourceShotId }">
                     <NSelect
+                        v-if="impactOptions.length || sourceShotId"
                         :value="sourceShot?.shotId ?? null"
                         :options="impactOptions"
                         placeholder="选择过期镜头，查看关联素材"
@@ -394,6 +391,34 @@ async function showStaleForms() {
                         class="asset-impact-select"
                         @update:value="selectImpactShot"
                     />
+                    <div class="form-image-filters" role="group" aria-label="形态图片筛选">
+                        <NInput
+                            placeholder="搜索主体、引用或形态"
+                            :input-props="{ 'aria-label': '搜索形态图片' }"
+                            v-model:value="search"
+                            clearable
+                            ><template #prefix><Search :size="14" /></template
+                        ></NInput>
+                        <NSelect
+                            aria-label="筛选主体类型"
+                            v-model:value="module"
+                            :options="[
+                                { label: String('全部类型'), value: 'all' },
+                                { label: String('人物'), value: 'character' },
+                                { label: String('场景'), value: 'scene' },
+                                { label: String('道具'), value: 'prop' }
+                            ]"
+                        ></NSelect>
+                        <div class="filter-toggles">
+                            <NCheckbox v-model:checked="onlyMissing">仅看缺少主图</NCheckbox>
+                            <NCheckbox v-model:checked="onlyStale">仅看身份过期</NCheckbox>
+                        </div>
+                        <span class="filter-result-count">{{ filtered.length }} 个形态</span>
+                    </div>
+                </div>
+            </div>
+            <div v-if="sourceShotId" class="asset-impact-context mt-3" aria-label="镜头与素材定位">
+                <div class="flex flex-wrap items-center gap-3">
                     <RouterLink v-if="sourceLocation" :to="sourceLocation" class="text-button"
                         >返回第 {{ sourceShot?.episodeNo }} 集 · 镜头 {{ sourceShot?.shotNo }} →</RouterLink
                     >
@@ -470,32 +495,6 @@ async function showStaleForms() {
                 }}</template>
                 <NButton text size="small" @click="resetFilters">清除定位</NButton>
             </NAlert>
-            <div class="form-image-filter-region">
-                <div class="form-image-filters" role="group" aria-label="形态图片筛选">
-                    <NInput
-                        placeholder="搜索主体、引用或形态"
-                        :input-props="{ 'aria-label': '搜索形态图片' }"
-                        v-model:value="search"
-                        clearable
-                        ><template #prefix><Search :size="14" /></template
-                    ></NInput>
-                    <NSelect
-                        aria-label="筛选主体类型"
-                        v-model:value="module"
-                        :options="[
-                            { label: String('全部类型'), value: 'all' },
-                            { label: String('人物'), value: 'character' },
-                            { label: String('场景'), value: 'scene' },
-                            { label: String('道具'), value: 'prop' }
-                        ]"
-                    ></NSelect>
-                    <div class="filter-toggles">
-                        <NCheckbox v-model:checked="onlyMissing">仅看缺少主图</NCheckbox>
-                        <NCheckbox v-model:checked="onlyStale">仅看身份过期</NCheckbox>
-                    </div>
-                    <span class="filter-result-count">{{ filtered.length }} 个形态</span>
-                </div>
-            </div>
             <NAlert v-if="query.error.value" role="alert" type="error" :show-icon="false" class="mt-4"
                 >{{ query.error.value }}<span v-if="forms.length"> 当前展示上次读取的数据。</span></NAlert
             ><NAlert v-if="running" role="status" type="info" :show-icon="false" class="mt-4">