fix: remove thinking mode (#835)

src/i18n/locales/en/chat.json

@@ -139,42 +139,6 @@
     "clearInput": "Clear input",
     "scrollToBottom": "Scroll to bottom"
   },
-  "thinkingMode": {
-    "selector": {
-      "title": "Thinking Mode",
-      "description": "Extended thinking gives Claude more time to evaluate alternatives",
-      "active": "Active",
-      "tip": "Higher thinking modes take more time but provide more thorough analysis"
-    },
-    "modes": {
-      "none": {
-        "name": "Standard",
-        "description": "Regular Claude response",
-        "prefix": ""
-      },
-      "think": {
-        "name": "Think",
-        "description": "Basic extended thinking",
-        "prefix": "think"
-      },
-      "thinkHard": {
-        "name": "Think Hard",
-        "description": "More thorough evaluation",
-        "prefix": "think hard"
-      },
-      "thinkHarder": {
-        "name": "Think Harder",
-        "description": "Deep analysis with alternatives",
-        "prefix": "think harder"
-      },
-      "ultrathink": {
-        "name": "Ultrathink",
-        "description": "Maximum thinking budget",
-        "prefix": "ultrathink"
-      }
-    },
-    "buttonTitle": "Thinking mode: {{mode}}"
-  },
   "providerSelection": {
     "title": "Choose Your AI Assistant",
     "description": "Select a provider to start a new conversation",