feat(tui): persist default permission mode

[haosenwang1018]

Related Issue

Fixes #258.

Problem

Kimi Code already supports default_permission_mode in config.toml, but the TUI only exposed session-scoped permission toggles. Users could turn on /yolo or pick a permission mode for the current session, then lose that preference when starting future sessions unless they edited config manually.

What changed

• Added /permission [manual|auto|yolo] for direct current-session permission changes while keeping the existing picker when no args are passed.
• Added /permission default <manual|auto|yolo> to persist defaultPermissionMode for new sessions and apply it to the active session so in-process /new uses the same mode.
• Added a Default Permission entry to /settings.
• Updated slash-command docs in English and Chinese.
• Added tests for direct permission args, persistent default permission, and the settings picker option.

Verification

• pnpm exec vitest run apps/kimi-code/test/tui/kimi-tui-message-flow.test.ts apps/kimi-code/test/tui/components/dialogs/choice-picker.test.ts
• pnpm --filter @moonshot-ai/kimi-code typecheck
• pnpm -C docs build
• pnpm run lint (0 errors; existing warnings only)
• pnpm --filter @moonshot-ai/kimi-code test
• pnpm changeset status --since origin/main
• git diff --check

[changeset-bot]

🦋 Changeset detected

Latest commit: de4cdee

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 1 package

Name	Type
@moonshot-ai/kimi-code	Patch

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