fix: token图标改用纯path SVG内联，避免text元素在部分系统不显示

src/renderer/index.html

@@ -34,7 +34,7 @@
                     <line x1="12" y1="17" x2="12.01" y2="17"/>
                 </svg>
             </button>
-            <span class="total-tokens" id="totalTokens" title="当前会话总 token 消耗"><svg class="token-icon" viewBox="0 0 16 16" fill="none"><circle cx="8" cy="8" r="7" stroke="currentColor" stroke-width="1.2"/><text x="8" y="11.5" text-anchor="middle" fill="currentColor" font-size="9" font-weight="700" font-family="sans-serif">T</text></svg> <span id="totalTokensValue">0</span></span>
+            <span class="total-tokens" id="totalTokens" title="当前会话总 token 消耗"><svg class="token-icon" viewBox="0 0 16 16" fill="none"><circle cx="8" cy="8" r="7" stroke="currentColor" stroke-width="1.2"/><path d="M5.2 5h5.6v1.5H9.2v6.2H6.8V6.5H5.2V5z" fill="currentColor"/></svg> <span id="totalTokensValue">0</span></span>
         </div>
         <div class="header-right">
             <div class="conn-status pending" id="connStatus" title="连接状态">