style: Compact search/filter forms across all pages

- Reduce card-body padding to p-2
- Change gap from g-3 to g-2
- Convert row columns to col-auto for compact layout
- Add form-control-sm and form-select-sm
- Shorten placeholder text and labels
- Applied to: Blog, Clients, Inquiries

Result: Search sections now take minimal vertical space,
table data dominates the view for better data density.

Co-Authored-By: Claude Haiku 4.5 <noreply@anthropic.com>

src/TaxBaik.Web/Pages/Admin/Blog/Index.cshtml

@@ -8,17 +8,21 @@
     @await Html.PartialAsync("_AdminPageHeader", new TaxBaik.Web.Models.AdminPageHeaderModel("콘텐츠", "블로그 관리", "검색, 발행 상태, 작성일 기준의 블로그 목록입니다.", "/admin/blog/create", "새 글 작성"))
 
     <div class="card">
-        <div class="card-body">
+        <div class="card-body p-2">
             <form method="get">
-                <div class="row g-3 align-items-end">
-                    <div class="col-md-6">
-                        <label class="form-label" for="SearchQuery">검색</label>
-                        <input class="form-control" id="SearchQuery" name="searchQuery" value="@Model.SearchQuery" placeholder="제목 또는 본문 검색" />
+                <div class="row g-2 align-items-end">
+                    <div class="col-md-4">
+                        <label class="form-label form-label-sm" for="SearchQuery">검색</label>
+                        <input class="form-control form-control-sm" id="SearchQuery" name="searchQuery" value="@Model.SearchQuery" placeholder="제목 또는 본문" />
                     </div>
-                    <div class="col-md-6 d-flex gap-2">
-                        <button class="btn btn-primary" type="submit">검색</button>
-                        <a class="btn btn-outline-secondary" href="/admin/blog">초기화</a>
-                        <a class="btn btn-outline-secondary" href="/admin/blog?showArchived=true">내린 글 보기</a>
+                    <div class="col-auto">
+                        <button class="btn btn-primary btn-sm" type="submit">검색</button>
+                    </div>
+                    <div class="col-auto">
+                        <a class="btn btn-outline-secondary btn-sm" href="/admin/blog">초기화</a>
+                    </div>
+                    <div class="col-auto">
+                        <a class="btn btn-outline-secondary btn-sm" href="/admin/blog?showArchived=true">내린 글</a>
                     </div>
                 </div>
             </form>