fix: show context-aware JSON editor hint and hide quick toggles for non-active providers

The hint text and ClaudeQuickToggles were misleading when editing
non-current providers or creating new ones, since the editor only
contains a config snippet rather than the full live settings.json.

src/i18n/locales/en.json

@@ -52,6 +52,7 @@
   "claudeConfig": {
     "configLabel": "Claude Code settings.json (JSON) *",
     "fullSettingsHint": "Full Claude Code settings.json content",
+    "fragmentSettingsHint": "Config snippet for this provider; will be written to settings.json when activated",
     "hideAttribution": "Hide AI Attribution",
     "alwaysThinking": "Extended Thinking",
     "enableTeammates": "Teammates Mode"

src/i18n/locales/ja.json

@@ -52,6 +52,7 @@
   "claudeConfig": {
     "configLabel": "Claude Code settings.json (JSON) *",
     "fullSettingsHint": "Claude Code の settings.json 全文",
+    "fragmentSettingsHint": "このプロバイダーの設定スニペット。有効化時に settings.json に書き込まれます",
     "hideAttribution": "AI署名を非表示",
     "alwaysThinking": "拡張思考",
     "enableTeammates": "Teammates モード"

src/i18n/locales/zh.json

@@ -52,6 +52,7 @@
   "claudeConfig": {
     "configLabel": "Claude Code 配置 (JSON) *",
     "fullSettingsHint": "完整的 Claude Code settings.json 配置内容",
+    "fragmentSettingsHint": "此供应商的配置片段，激活后将写入 settings.json",
     "hideAttribution": "隐藏 AI 署名",
     "alwaysThinking": "扩展思考",
     "enableTeammates": "Teammates 模式"