[Studio] fix: validate pasted message properties

[yuluo-yx]

Summary

• report malformed and empty-key batch property tokens
• reject duplicate property names instead of overwriting values
• preserve valid values after the first equals sign and block sending on parse errors

Fixes #2154

Validation

• TopicPage.test.tsx: 13 passed
• npm run build passed
• targeted Prettier and ESLint passed
• scope check: 81 changed lines

Base

rocketmq-studio at 737a7b4

[RockteMQ-AI]

Summary

This PR extracts message property parsing into a dedicated utility (parseMessageProperties.ts) with proper validation for malformed entries, empty keys, and duplicate property names. The validation prevents sending messages with invalid properties and provides clear error feedback to users.

Good refactoring with comprehensive test coverage. LGTM.

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Automated review by github-manager-bot

[lizhimins]

Closing per contribution guideline #2107: these are fragmented one-off changes of the same theme (one PR per guard/fix/page). Please group related changes into cohesive pull requests and resubmit — your contributions are welcome in a consolidated shape.