chore(ai-chat): clarify mode-info hints with explicit click-to-switch

Append "(Click to switch)" to each AI_CHAT_MODE_INFO_* string so the
mode-info row reads as actionable, and shorten the keyboard hint to
"[or Shift+Tab]".

Author: abose

src/nls/root/strings.js

@@ -2270,10 +2270,10 @@ define({
     "AI_CHAT_MODE_PLAN": "Plan Mode",
     "AI_CHAT_MODE_EDIT": "Edit Mode",
     "AI_CHAT_MODE_FULL_AUTO": "Full Auto",
-    "AI_CHAT_MODE_INFO_PLAN": "AI will propose a plan before making changes",
-    "AI_CHAT_MODE_INFO_EDIT": "AI can edit files. Shell commands need approval",
-    "AI_CHAT_MODE_INFO_FULL_AUTO": "AI can edit files and run commands without approval",
-    "AI_CHAT_MODE_SWITCH_HINT": "(Shift+Tab to switch)",
+    "AI_CHAT_MODE_INFO_PLAN": "AI will propose a plan before making changes (Click to switch)",
+    "AI_CHAT_MODE_INFO_EDIT": "AI can edit files. Shell commands need approval (Click to switch)",
+    "AI_CHAT_MODE_INFO_FULL_AUTO": "AI can edit files and run commands without approval (Click to switch)",
+    "AI_CHAT_MODE_SWITCH_HINT": "[or Shift+Tab]",
     "AI_CHAT_INPUT_HINT": "Press {0} to send · {1} for new line",
     "AI_CHAT_BASH_CONFIRM_TITLE": "Allow command?",
     "AI_CHAT_BASH_ALLOW": "Allow",