feat(usage): use modal dialog for editing model prices

src/components/usage/PriceSettingsCard.tsx

@@ -3,6 +3,7 @@ import { useTranslation } from 'react-i18next';
 import { Card } from '@/components/ui/Card';
 import { Button } from '@/components/ui/Button';
 import { Input } from '@/components/ui/Input';
+import { Modal } from '@/components/ui/Modal';
 import { Select } from '@/components/ui/Select';
 import type { ModelPrice } from '@/utils/usage';
 import styles from '@/pages/UsagePage.module.scss';
@@ -20,11 +21,18 @@ export function PriceSettingsCard({
 }: PriceSettingsCardProps) {
   const { t } = useTranslation();
 
+  // Add form state
   const [selectedModel, setSelectedModel] = useState('');
   const [promptPrice, setPromptPrice] = useState('');
   const [completionPrice, setCompletionPrice] = useState('');
   const [cachePrice, setCachePrice] = useState('');
 
+  // Edit modal state
+  const [editModel, setEditModel] = useState<string | null>(null);
+  const [editPrompt, setEditPrompt] = useState('');
+  const [editCompletion, setEditCompletion] = useState('');
+  const [editCache, setEditCache] = useState('');
+
   const handleSavePrice = () => {
     if (!selectedModel) return;
     const prompt = parseFloat(promptPrice) || 0;
@@ -44,12 +52,22 @@ export function PriceSettingsCard({
     onPricesChange(newPrices);
   };
 
-  const handleEditPrice = (model: string) => {
+  const handleOpenEdit = (model: string) => {
     const price = modelPrices[model];
-    setSelectedModel(model);
-    setPromptPrice(price?.prompt?.toString() || '');
-    setCompletionPrice(price?.completion?.toString() || '');
-    setCachePrice(price?.cache?.toString() || '');
+    setEditModel(model);
+    setEditPrompt(price?.prompt?.toString() || '');
+    setEditCompletion(price?.completion?.toString() || '');
+    setEditCache(price?.cache?.toString() || '');
+  };
+
+  const handleSaveEdit = () => {
+    if (!editModel) return;
+    const prompt = parseFloat(editPrompt) || 0;
+    const completion = parseFloat(editCompletion) || 0;
+    const cache = editCache.trim() === '' ? prompt : parseFloat(editCache) || 0;
+    const newPrices = { ...modelPrices, [editModel]: { prompt, completion, cache } };
+    onPricesChange(newPrices);
+    setEditModel(null);
   };
 
   const handleModelSelect = (value: string) => {
@@ -147,7 +165,7 @@ export function PriceSettingsCard({
                     </div>
                   </div>
                   <div className={styles.priceActions}>
-                    <Button variant="secondary" size="sm" onClick={() => handleEditPrice(model)}>
+                    <Button variant="secondary" size="sm" onClick={() => handleOpenEdit(model)}>
                       {t('common.edit')}
                     </Button>
                     <Button variant="danger" size="sm" onClick={() => handleDeletePrice(model)}>
@@ -162,6 +180,57 @@ export function PriceSettingsCard({
           )}
         </div>
       </div>
+
+      {/* Edit Modal */}
+      <Modal
+        open={editModel !== null}
+        title={editModel ?? ''}
+        onClose={() => setEditModel(null)}
+        footer={
+          <div className={styles.priceActions}>
+            <Button variant="secondary" onClick={() => setEditModel(null)}>
+              {t('common.cancel')}
+            </Button>
+            <Button variant="primary" onClick={handleSaveEdit}>
+              {t('common.save')}
+            </Button>
+          </div>
+        }
+        width={420}
+      >
+        <div className={styles.editModalBody}>
+          <div className={styles.formField}>
+            <label>{t('usage_stats.model_price_prompt')} ($/1M)</label>
+            <Input
+              type="number"
+              value={editPrompt}
+              onChange={(e) => setEditPrompt(e.target.value)}
+              placeholder="0.00"
+              step="0.0001"
+            />
+          </div>
+          <div className={styles.formField}>
+            <label>{t('usage_stats.model_price_completion')} ($/1M)</label>
+            <Input
+              type="number"
+              value={editCompletion}
+              onChange={(e) => setEditCompletion(e.target.value)}
+              placeholder="0.00"
+              step="0.0001"
+            />
+          </div>
+          <div className={styles.formField}>
+            <label>{t('usage_stats.model_price_cache')} ($/1M)</label>
+            <Input
+              type="number"
+              value={editCache}
+              onChange={(e) => setEditCache(e.target.value)}
+              placeholder="0.00"
+              step="0.0001"
+            />
+          </div>
+        </div>
+      </Modal>
     </Card>
   );
 }

src/pages/UsagePage.module.scss

@@ -809,6 +809,12 @@
   flex-shrink: 0;
 }
 
+.editModalBody {
+  display: flex;
+  flex-direction: column;
+  gap: 12px;
+}
+
 // Chart Section (80%比例)
 .chartSection {
   display: flex;