Rework the math parser

[cyanzhong]

No description provided.

[Copilot]

🔵 Needs a closer look

The custom incremental parser and retry behavior require runtime validation beyond static review.

Pull request overview

Reworks block-math parsing into a dedicated module with container-aware content ranges, incremental retry handling, TeX highlighting, and updated previews.

Changes:

• Adds comprehensive math parser and preview tests.
• Moves parser logic into src/modules/math.
• Extracts math preview handling and removes the legacy parser.

File summaries

File	Description
CoreEditor/test/math.test.ts	Adds parser, incremental parsing, highlighting, and preview tests.
CoreEditor/test/lezer.test.ts	Removes math tests relocated to the dedicated suite.
CoreEditor/src/modules/math/index.ts	Implements the new block-math parser and retry logic.
CoreEditor/src/styling/nodes/math.ts	Adds content-aware math preview decorations.
CoreEditor/src/styling/nodes/code.ts	Removes math preview code.
CoreEditor/src/styling/markdown.ts	Registers the new parser and preview module.
CoreEditor/src/@vendor/joplin/markdownMathParser.ts	Removes the superseded implementation.

Review details

• Files reviewed: 7/7 changed files
• Comments generated: 0
• Review effort level: Lite

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