fix(thinkingPlugin): update thinking condition to use length check

[gene9831]

问题：在某些场景出现 "正在思考->已思考->正在思考" 状态频繁转换

reasoning_content 在传输过程中可能是长度大于0的空白字符串

Summary by CodeRabbit

• Bug Fixes
  • Improved detection of thinking content so whitespace-only text is handled consistently.

[coderabbitai]

Walkthrough

The thinking plugin now marks any non-empty reasoning_content string as thinking content. Whitespace-only strings now qualify.

Changes

Thinking Content Detection

Layer / File(s)	Summary
Reasoning content condition packages/kit/src/message/plugins/thinkingPlugin.ts	The plugin no longer trims reasoning_content before checking whether the string is non-empty.

Estimated code review effort: 1 (Trivial) | ~2 minutes

Poem

A rabbit checks the thought-stream bright,
Even spaces count when strings have length in sight.
The plugin hops, the test is clear,
Whitespace reasoning now appears.
Tiny change, neatly done—
The thinking flag has won!

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
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.
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title clearly describes the change to use a length check for thinking content in thinkingPlugin.

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests

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[coderabbitai]

Actionable comments posted: 1

🤖 Prompt for all review comments with AI agents

Verify each finding against current code. Fix only still-valid issues, skip the
rest with a brief reason, keep changes minimal, and validate.

Inline comments:
In `@packages/kit/src/message/plugins/thinkingPlugin.ts`:
- Line 16: Align the predicate used by thinkingPlugin and defaultRenderers so
whitespace-only reasoning_content is treated consistently. Update the thinking
state check around reasoning_content to use the same trimmed-content semantics
as the Reasoning.vue renderer, or reuse a shared predicate if one exists, while
preserving behavior for non-empty reasoning content.

🪄 Autofix

Fix all unresolved CodeRabbit comments on this PR:

• Push a commit to this branch (recommended)
• Create a new PR with the fixes

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ℹ️ Review info

⚙️ Run configuration

Configuration used: Repository UI

Review profile: CHILL

Plan: Pro Plus

Run ID: c4609f7f-8de8-4ae8-b284-61683ba0ff5a

📥 Commits

Reviewing files that changed from the base of the PR and between ca51f9d and fb7dac8.

📒 Files selected for processing (1)

• packages/kit/src/message/plugins/thinkingPlugin.ts

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