feat: 更新侧边栏按钮，添加目标仓库链接和样式优化

sidepanel/sidepanel.html

@@ -137,7 +137,8 @@
             <option value="sub2api">SUB2API</option>
             <option value="codex2api">Codex2API</option>
           </select>
-          <button id="btn-open-webchat2api-github" class="btn btn-ghost btn-xs data-inline-btn" type="button">GitHub</button>
+          <button id="btn-open-target-repository" class="btn btn-outline btn-sm data-inline-btn" type="button"
+            aria-label="打开项目 GitHub 仓库" title="打开项目 GitHub 仓库">GitHub</button>
         </div>
       </div>
         <div id="contribution-mode-panel" class="contribution-mode-panel" hidden>
@@ -258,11 +259,8 @@
       </div>
       <div class="data-row" id="row-kiro-rs-url" style="display:none;">
         <span class="data-label">kiro.rs</span>
-        <div class="data-inline">
-          <input type="text" id="input-kiro-rs-url" class="data-input"
-            placeholder="请输入 kiro.rs 管理地址" />
-          <button id="btn-open-kiro-rs-github" class="btn btn-ghost btn-xs data-inline-btn" type="button">GitHub</button>
-        </div>
+        <input type="text" id="input-kiro-rs-url" class="data-input"
+          placeholder="请输入 kiro.rs 管理地址" />
       </div>
       <div class="data-row" id="row-kiro-rs-key" style="display:none;">
         <span class="data-label">API Key</span>