v14.0-G7: send code btn absolute positioned text-only, no hover bg

Author: zcj220

extension/src/sidebarProvider.ts

@@ -1702,15 +1702,18 @@ ${commonRules}`;
     }
     .sdrop-eye-btn:hover { opacity: 1; }
     .sdrop-eye-btn:focus { outline: none; }
-    /* 发送验证码 — 嵌入式蓝字按钮 */
+    /* 发送验证码——绝对定位文字按钮 */
+    .sdrop-code-wrap { position: relative; margin-bottom: 5px; }
+    .sdrop-code-wrap input { width: 100%; box-sizing: border-box; padding-right: 38px; }
     .sdrop-send-code-btn {
-      flex-shrink: 0; padding: 0 8px; height: 100%;
-      background: none; border: none; cursor: pointer;
+      position: absolute; right: 6px; top: 50%; transform: translateY(-50%);
+      background: none; border: none; padding: 0;
       font-size: 11px; font-weight: 600; color: var(--btn-bg);
-      white-space: nowrap; outline: none;
+      cursor: pointer; outline: none; line-height: 1;
+      -webkit-tap-highlight-color: transparent;
     }
-    .sdrop-send-code-btn:disabled { opacity: 0.4; cursor: not-allowed; }
-    .sdrop-send-code-btn:hover:not(:disabled) { opacity: 0.75; }
+    .sdrop-send-code-btn:hover:not(:disabled) { opacity: 0.65; }
+    .sdrop-send-code-btn:disabled { opacity: 0.35; cursor: not-allowed; }
     .sdrop-login-btn {
       width: 100%; height: 28px; padding: 0 6px; font-size: 11px; font-weight: 600;
       background: var(--btn-bg); color: var(--btn-fg);
@@ -1782,8 +1785,8 @@ ${commonRules}`;
             <div id="registerForm" style="display:none">
               <div id="regError" class="auth-error"></div>
               <input id="regEmail" type="email" placeholder="邮箱地址" autocomplete="email" />
-              <div class="sdrop-pass-wrap">
-                <input id="regCode" type="text" placeholder="邮箱验证码（6位）" autocomplete="off" maxlength="6" />
+              <div class="sdrop-code-wrap">
+                <input id="regCode" type="text" placeholder="输入验证码" autocomplete="off" maxlength="6" />
                 <button class="sdrop-send-code-btn" id="btnSendCode">发送</button>
               </div>
               <input id="regUser" type="text" placeholder="用户名" autocomplete="username" />