fix: preserve code spans adjacent to tildes

[Hona]

Marked version: master / 18.0.5

Markdown flavor: GitHub Flavored Markdown

Description

• Fixes Inline code after a tilde is parsed with shifted backticks #4011
• Keep adjacent tilde and backtick delimiter runs separate so complete code spans remain available to the code-span tokenizer.
• Keep delimiter handling in the selected GFM text grammar and stop immediately at mixed delimiter boundaries.
• Cover both delimiter orders, multi-backtick code spans, and code nested in strikethrough.

Contributor

• Test(s) exist to ensure functionality and minimize regression.
• No documentation change is required because this restores existing GFM parsing behavior.

Committer

In most cases, this should be a different person than the contributor.

• CI is green (no forced merge required).
• Squash and Merge PR following conventional commit guidelines.

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Pull request overview

Fixes a GFM inline parsing edge case where a literal ~ immediately adjacent to backtick runs could cause the inline “text” rule to consume part of a code span opener/closer, leading to shifted/incorrect code span pairing (as described in #4011).

Changes:

• Adjusted the GFM inline text regex to keep adjacent tilde and backtick delimiter runs separate (\+vs~+`), so the codespan tokenizer still sees complete backtick runs.
• Added a new spec test covering both delimiter orders, multi-backtick code spans, and code nested in strikethrough.

Reviewed changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated no comments.

File	Description
test/specs/new/codespan_adjacent_tilde.md	Adds markdown fixtures reproducing the adjacency cases that previously broke codespan pairing.
test/specs/new/codespan_adjacent_tilde.html	Adds expected HTML output for the new adjacency fixtures to prevent regressions.
src/rules.ts	Updates the GFM inline text rule so it no longer collapses mixed `/~ runs into a single token that can hide codespan delimiters.

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Project	Deployment	Actions	Updated (UTC)
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