feat(前端界面): 新增视图旋转，统一界面文案与按钮对齐

assets/webui/index.html

@@ -36,6 +36,7 @@
 				<button id="zoomInButton" class="icon-button" type="button" title="放大" disabled>+</button>
 				<button id="fitButton" class="button" type="button" data-short="宽" aria-label="适宽" disabled>适宽</button>
 				<button id="fitHeightButton" class="button" type="button" data-short="高" aria-label="适高" disabled>适高</button>
+				<button id="rotateButton" class="button" type="button" data-short="转" title="顺时针旋转90°" aria-label="旋转" disabled>旋转</button>
 				<button id="continuousButton" class="button" type="button" data-short="连" title="无距连续显示" aria-label="无距连续显示" aria-pressed="false" disabled>连续</button>
 				<button id="annotationButton" class="button" type="button" data-short="注" title="关闭注解" aria-label="关闭注解" aria-pressed="true">注解</button>
 			</div>
@@ -164,7 +165,7 @@
 							<button id="fontDirectoryButton" class="small-button" type="button" title="添加字体目录" aria-label="添加字体目录">目录</button>
 						</div>
 					</div>
-					<div id="fontPermissionHint" class="font-permission-hint" hidden>系统字体需授权</div>
+					<div id="fontPermissionHint" class="font-permission-hint" hidden>字体尚未授权</div>
 					<div id="fontList" class="font-list"></div>
 				</section>
 			</aside>