feat(claude): upgrade effort toggle from "high" to "max"

Per Anthropic's effort parameter docs, "high" is the API default and
setting effortLevel="high" is equivalent to omitting the field entirely.
The toggle previously produced no effect.

Claude Opus 4.6, Sonnet 4.6, and Opus 4.7 now support a "max" level
that enables unconstrained reasoning. Rename the checkbox (effortHigh
-> effortMax) and write effortLevel="max" when toggled on. Existing
"high" values in user configs are left untouched.

Updates zh/en/ja locales and user-manual entries accordingly.

src/i18n/locales/en.json

@@ -80,7 +80,7 @@
     "hideAttribution": "Hide AI Attribution",
     "enableTeammates": "Teammates Mode",
     "enableToolSearch": "Enable Tool Search",
-    "effortHigh": "High Effort Thinking",
+    "effortMax": "Max Effort Thinking",
     "disableAutoUpgrade": "Disable Auto-Upgrade"
   },
   "header": {

src/i18n/locales/ja.json

@@ -80,7 +80,7 @@
     "hideAttribution": "AI署名を非表示",
     "enableTeammates": "Teammates モード",
     "enableToolSearch": "Tool Search を有効化",
-    "effortHigh": "高強度思考",
+    "effortMax": "最大強度思考",
     "disableAutoUpgrade": "自動アップグレードを無効化"
   },
   "header": {

src/i18n/locales/zh.json

@@ -80,7 +80,7 @@
     "hideAttribution": "隐藏 AI 署名",
     "enableTeammates": "Teammates 模式",
     "enableToolSearch": "启用 Tool Search",
-    "effortHigh": "高强度思考",
+    "effortMax": "最大强度思考",
     "disableAutoUpgrade": "禁用自动升级"
   },
   "header": {