fix(model-pricing): refresh tiered expression editor when switching models

[feitianbubu]

📝 变更描述 / Description

表达式定价模式下,在模型列表里切换模型时,右侧内容区不刷新——只有名称变了,阶梯条件和价格还是上一个模型的,很容易改错价。(per-token、按次模式正常)

原因是表达式编辑器 TieredPricingEditor 的内部状态只在挂载时初始化一次,切模型时没去重新读取新数据。

改法:加载新模型时给编辑器换 key 触发重挂载,让它按新模型的表达式重新渲染一遍。

🚀 变更类型 / Type of change

• 🐛 Bug 修复 (Bug fix)

🔗 关联任务 / Related Issue

• Closes v1.0.0-rc.15 新版本UI中的模型定价功能，截止目前版本，仍然存在连续选择不同模型，表达式定价内容区不刷新问题，容易导致误改定价问题。 #5750

✅ 提交前检查项 / Checklist

• 人工确认: 描述为人工撰写整理。
• 非重复提交: 已检索现有 Issue / PR。
• Bug fix 说明: 已关联 v1.0.0-rc.15 新版本UI中的模型定价功能，截止目前版本，仍然存在连续选择不同模型，表达式定价内容区不刷新问题，容易导致误改定价问题。 #5750。
• 变更理解: 已理解原理及影响。
• 范围聚焦: 仅改动 model-pricing-sheet.tsx(3 行)。
• 本地验证: bun run typecheck 通过,无新增 lint。
• 安全合规: 无敏感凭据。

📸 运行证明 / Proof of Work

复现步骤(同 #5750):表达式模式下先选模型qwen3.6-plus,再选模型 qwen3.6-max-preview。

• 修复前:内容区仅名称变为 qwen3.6-max-preview,阶梯条件与价格仍是 qwen3.6-plus 的。
• 修复后:切到 qwen3.6-max-preview 时阶梯与价格随名称一起刷新。

[coderabbitai]

Walkthrough

The model pricing editor now tracks a reload token when edit data is initialized and uses it as the key for TieredPricingEditor, forcing the editor to remount when switching models.

Changes

Model pricing editor reset

Layer / File(s)	Summary
Token state and remount wiring web/default/src/features/system-settings/models/model-pricing-sheet.tsx	Adds editorReloadToken state, increments it during editData initialization, and passes it to TieredPricingEditor as the key.

Estimated code review effort

🎯 2 (Simple) | ⏱️ ~10 minutes

Poem

A rabbit hopped by, whiskers alight,
Swapping model edits felt just right.
A token twitched, then off it flew,
Fresh pricing panes came into view.
Hop! No stale carrots left in sight.

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title clearly describes the main fix: refreshing the tiered pricing editor when switching models.
Linked Issues check	✅ Passed	The change remounts the expression pricing editor on model switch, matching the linked issue's refresh requirement.
Out of Scope Changes check	✅ Passed	The PR stays narrowly focused on the model pricing editor refresh behavior and adds no unrelated changes.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests

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