feat(acp): honor Claude auto-compaction window

[MoozLee]

Summary

• Forward CLAUDE_CODE_AUTO_COMPACT_WINDOW into Claude Code ACP session metadata as options.settings.autoCompactWindow.
• Preserve existing Claude Code user SDK options from ~/.claude/settings.json while merging the configured auto-compaction window.
• Add the Claude 1M context beta when the configured auto-compaction window exceeds the default 200K window.
• Update the status bar context-window display to prefer the configured Claude Code auto-compaction limit, so the shown denominator and percentage match the effective compaction threshold.

Test plan

• cargo test --manifest-path src-tauri/Cargo.toml --lib build_new_session_request
• cargo test --manifest-path src-tauri/Cargo.toml --lib build_load_session_request
• cargo check --manifest-path src-tauri/Cargo.toml
• cargo check --manifest-path src-tauri/Cargo.toml --bin codeg-server --no-default-features
• pnpm eslint src/components/layout/status-bar-tokens.tsx

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摘要

• 将 CLAUDE_CODE_AUTO_COMPACT_WINDOW 写入 Claude Code ACP 会话 metadata，即 options.settings.autoCompactWindow。
• 合并自定义压缩窗口时，保留 ~/.claude/settings.json 中已有的 Claude Code 用户 SDK options。
• 当配置的自动压缩窗口超过默认 200K 时，自动追加 Claude 1M context beta。
• 更新状态栏上下文窗口展示逻辑，优先使用 Claude Code 配置的自动压缩窗口，保证展示的分母和百分比与实际压缩阈值一致。

测试计划

• cargo test --manifest-path src-tauri/Cargo.toml --lib build_new_session_request
• cargo test --manifest-path src-tauri/Cargo.toml --lib build_load_session_request
• cargo check --manifest-path src-tauri/Cargo.toml
• cargo check --manifest-path src-tauri/Cargo.toml --bin codeg-server --no-default-features
• pnpm eslint src/components/layout/status-bar-tokens.tsx