fix(cli): treat CRLF as paste in passthrough mode

[BingqingLyu]

Fixes QwenLM#299.

Windows paste workaround (stdin passthrough) can receive a standalone CRLF chunk during multiline paste. Treating it as a normal return can trigger submit and break pasting.

Changes:

• Treat standalone as a paste event in passthrough mode.
• Add a regression test for the CRLF case.

Tests:

• npx vitest packages/cli/src/ui/contexts/KeypressContext.test.tsx --run

[BingqingLyu]

Conflict Group 1

This PR shares modified functions with 2 other PR(s): #87, #94.

These PRs should be reviewed as a batch — merging one may affect the others.

Function	File	Also modified by
KeypressProvider	KeypressContext.tsx	#87, #94

graph LR
    PR37["PR #37"]
    FKeypressProvider_396["KeypressProvider<br>KeypressContext.tsx"]
    PR37 -->|modifies| FKeypressProvider_396
    PR87["PR #87"]
    PR87 -->|modifies| FKeypressProvider_396
    PR94["PR #94"]
    PR94 -->|modifies| FKeypressProvider_396

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