feat(desktop): accept K/M context window inputs

[sunrioa]

Summary

Allow context window inputs in Desktop model settings to accept decimal K/M shorthand, such as 128K, 1M, and 1.5m, alongside plain integers.

Both adding and editing models use the same parser. Values remain positive safe integers in storage (K = 1,000; M = 1,000,000). Invalid input shows a validation error and cannot be saved. Single-click saving, cancellation, and clearing an existing declaration are preserved.

Fixes #5168

Verification

• Passed root build, lint, format:check, typecheck, and Desktop/UI Knip.
• Passed all 2,484 Desktop tests and 37 Desktop E2E tests.
• Passed Storybook build and render smoke: 332 stories, 359 theme renders.
• Passed renderer architecture, Astryx inventory and inventory tests, theme drift, E2E budget, and ASF header checks.

Before: entering 1M leaves the field empty and triggers the required-field error.

After: adding a model with 1M.

After: editing a model's context window to 1.5m.

AI use

• No generative tool made a substantive contribution
• Generative tooling made a substantive contribution

Tool(s) and scope: OpenAI Codex — implementation, regression tests, and validation; reviewed by the author.

Checklist

• Tests cover the change and fail without it
• Lint, format, typecheck and the affected suites pass locally

Does this PR entail a change in behavior?

• Yes — described under Summary above
• No

[me2seeks]

PR 5171 Review

结论

APPROVE
K/M 上下文窗口输入的解析器 parseContextWindowInput（context-window-input.ts）逻辑核实：用字符串移位而非浮点乘法避免 1.001*1000 精度问题，fraction.slice(places) 含非零即拒绝小数残留（1.0000001M→null），Number.isSafeInteger && >0 兜底；负数、1e6、1MB、.5M、1. 均被正则拒绝。两处 UI（add-model 对话框、connection-detail 编辑行）改为同一 parser；编辑行用 changeContextWindow 把合法值/空串写入 draft，非法文本保留显示但不覆盖既有声明（provider-connection-detail.ts:313-318），且 canSave/onSave 双重挡住非法保存。测试（含 E2E context-window-save.spec.ts 往返 1M/1.5m/256K/清空）覆盖正反例。

[me2seeks]

Maka auto review

Reviewed commit 293a308. No actionable findings. Both model forms share an exact decimal K/M parser and persist positive safe integer token counts. Invalid-input blocking, cancellation, and clearing declarations remain coherent.

Validation: full Desktop build with workspace dependencies passed; 20 focused parser/profile-draft tests passed; the real Electron context-window-save E2E passed on Linux with isolated fixture data, covering one-click focused saving, 1M/1.5m persistence, invalid input, cancellation, and clearing. No Windows/macOS packaged-app validation was performed in this review.

中文

已复核当前提交，未发现需要修改的问题。添加和编辑模型共用精确的十进制 K/M 解析器，保存值仍为正安全整数；非法输入、取消和清空声明处理一致。

完整 Desktop 及依赖构建成功，20 项相关单元测试通过，Linux 真实 Electron 窗口测试通过，覆盖聚焦时一次点击保存、1M/1.5m 持久化、非法输入、取消和清空。使用隔离测试数据，本轮未进行 Windows/macOS 打包应用验证。