fix(i18n): split fetch_complete into singular and plural forms

Update translation files to properly handle singular/plural cases for search results display

src/renderer/src/i18n/locales/en-us.json

@@ -1764,7 +1764,8 @@
     },
     "websearch": {
       "cutoff": "Truncating search content...",
-      "fetch_complete": "{{count}} search result(s)",
+      "fetch_complete_one": "{{count}} search result",
+      "fetch_complete_other": "{{count}} search results",
       "rag": "Executing RAG...",
       "rag_complete": "Keeping {{countAfter}} out of {{countBefore}} results...",
       "rag_failed": "RAG failed, returning empty results..."

src/renderer/src/i18n/locales/zh-cn.json

@@ -1764,7 +1764,8 @@
     },
     "websearch": {
       "cutoff": "正在截断搜索内容...",
-      "fetch_complete": "{{count}} 个搜索结果",
+      "fetch_complete_one": "{{count}} 个搜索结果",
+      "fetch_complete_other": "{{count}} 个搜索结果",
       "rag": "正在执行 RAG...",
       "rag_complete": "保留 {{countBefore}} 个结果中的 {{countAfter}} 个...",
       "rag_failed": "RAG 失败，返回空结果..."

src/renderer/src/i18n/locales/zh-tw.json

@@ -1764,7 +1764,8 @@
     },
     "websearch": {
       "cutoff": "正在截斷搜尋內容...",
-      "fetch_complete": "{{count}} 個搜尋結果",
+      "fetch_complete_one": "{{count}} 個搜尋結果",
+      "fetch_complete_other": "{{count}} 個搜尋結果",
       "rag": "正在執行 RAG...",
       "rag_complete": "保留 {{countBefore}} 個結果中的 {{countAfter}} 個...",
       "rag_failed": "RAG 失敗，返回空結果..."