Make context bar clickable to re-fetch model context window

클릭하면 캐시 초기화 후 서버에서 최대값 재확인.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

web-ui/code.html

@@ -238,7 +238,7 @@
             <span id="code-ai-session-bar-count" style="font-size:10px;color:var(--muted);flex-shrink:0"></span>
           </div>
           <!-- 컨텍스트 사용량 -->
-          <div id="code-ai-ctx-wrap" title="컨텍스트 사용량 (추정)" style="display:none;flex-shrink:0;display:flex;align-items:center;gap:4px;cursor:default">
+          <div id="code-ai-ctx-wrap" title="클릭하면 최대값 재확인" onclick="_codeAiCtxMaxFetchedFor='';_fetchModelCtxMax(codeAiModel);" style="display:none;flex-shrink:0;display:flex;align-items:center;gap:4px;cursor:pointer">
             <span id="code-ai-ctx-label" style="font-size:10px;color:var(--muted);white-space:nowrap"></span>
             <div style="width:60px;height:5px;background:rgba(255,255,255,.1);border-radius:3px;overflow:hidden;flex-shrink:0">
               <div id="code-ai-ctx-fill" style="height:100%;width:0%;border-radius:3px;transition:width .4s,background .4s"></div>