feat(web): drop "none" from the offered thinking levels (#34)

Co-authored-by: Alice <alice@prismshadow.com>
Co-authored-by: Claude Fable 5 <noreply@anthropic.com>

packages/web/src/lib/strings-en.ts

@@ -197,7 +197,6 @@ export const en: Strings = {
     thinkingLevel: "model.thinking_level",
     thinkingLevelOptions: [
       ["", "Send no override — keep whatever is currently configured."],
-      ["none", "Disables extended reasoning; the fastest responses."],
       ["low", "Enables a lower tier of extended reasoning."],
       [
         "medium",
@@ -209,6 +208,8 @@ export const en: Strings = {
         "Enables the highest tier of extended reasoning; identical to high on some models.",
       ],
     ] as ReadonlyArray<readonly [string, string]>,
+    thinkingLevelNoneKept:
+      "Stored legacy tier: new selections no longer offer the off tier (many models cannot disable thinking).",
     timeoutMs: "model.timeoutMs",
     timeoutMsHint: "Per-request timeout, ms",
     compaction: "Context compaction",

packages/web/src/lib/strings.ts

@@ -188,14 +188,16 @@ export const zh = {
     maxTurns: "max_turns（单 Task 最大轮次，-1 不限制）",
     maxTokens: "model.max_tokens",
     thinkingLevel: "model.thinking_level",
+    /** Selectable tiers exclude `none` (many models cannot disable thinking); a stored `none` still displays — see `thinkingLevelNoneKept`. */
     thinkingLevelOptions: [
       ["", "不提交覆盖值，沿用当前生效的配置。"],
-      ["none", "关闭扩展推理，响应最快。"],
       ["low", "开启较低强度的扩展推理。"],
       ["medium", "开启中等强度的扩展推理（新建 Agent 的缺省档位）。"],
       ["high", "开启较高强度的扩展推理，响应更慢。"],
       ["xhigh", "开启最高强度的扩展推理，部分模型上效果与 high 相同。"],
     ] as ReadonlyArray<readonly [string, string]>,
+    /** Row description shown only while the stored config is `none`: displayed as-is, never rewritten, and no longer offered as a choice. */
+    thinkingLevelNoneKept: "已存的历史档位：新选择不再提供关闭档（多数模型不支持关闭思考）。",
     timeoutMs: "model.timeoutMs",
     timeoutMsHint: "单次 Request 超时，毫秒",
     compaction: "上下文压缩（compaction）",
@@ -463,7 +465,7 @@ export const zh = {
     chooseAgent: "选择 Agent",
     chooseModel: "选择模型",
     thinkingLevel: "思考等级",
-    /** 会话前拾取器的档位短名（评审要求：只写短名、不带说明、无“缺省”项）。 */
+    /** Short tier names for the pre-conversation picker (per review: short names only, no descriptions, no "default" row). `none` exists purely to display a stored legacy value — it is never offered as a choice (many models cannot disable thinking). */
     thinkingLevelNames: {
       none: "无",
       low: "低",