fix(web): normalize composer whitespace

[joscabmar]

Summary

• normalize CRLF, CR, and non-breaking spaces before comparing the pasted ChatGPT composer text
• preserve strict verification for all other prompt content before submission

Validation

• manually reproduced the editor conversion of an indented space to U+00A0
• verified a 15,176-character prompt with one reference image passed the patched pre-send check and was submitted once through the web backend
• no automated regression test was added by request

Summary by CodeRabbit

• Bug Fixes
  • Pasted prompts now handle Windows and legacy line endings consistently.
  • Non-breaking spaces are normalized to regular spaces during verification, while other content remains subject to exact matching.

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ℹ️ Recent review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Advanced

Run ID: 7333c2b1-ecc1-4cde-953f-1af2090e24e5

📥 Commits

Reviewing files that changed from the base of the PR and between 1df8a9d and d6463cb.

📒 Files selected for processing (1)

• image-use

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📝 Walkthrough

Walkthrough

Composer verification now normalizes CRLF, CR, and non-breaking spaces to equivalent forms before comparing the pasted prompt. Other content remains subject to exact comparison.

Changes

Composer verification

Layer / File(s)	Summary
Canonicalization and verification image-use	Added _canonicalize_composer_text and updated prompt verification to compare normalized composer text.

Priority: ⬇️ Low

Estimated code review effort: 1 (Trivial) | ~5 minutes

Change: Bug fix

Suggested reviewers: leeguooooo

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title clearly and concisely describes the main change: normalizing composer whitespace in the web prompt verification flow.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check. Docstring coverage is scoped to functions touched by this diff. Analyzed 0 functions across 0…
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.

✨ Finishing Touches

🧪 Generate unit tests (beta)

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[leeguooooo]

已在 75b4e22 重新落地，另加了回归测试，随 v0.29.2 发布。感谢！