fix(ui): preserve parenthesized tildes in markdown

[Githubguy132010]

Issue

Fixes #12530

Context

Marked treats a tilde immediately preceded by ( as a closing strikethrough delimiter. As a result, ordinary expressions such as (~24 GB) and (~5.7 GB) can form an unintended strikethrough span in rendered chat messages.

Implementation

Reject the invalid closing delimiter at the existing Marked tokenizer boundary while preserving valid single- and double-tilde strikethrough syntax. Regression coverage includes the minimal issue reproduction, the reported size example, tilde paths, and valid strikethrough forms.

Screenshots / Video

Before:

After:

How to Test

Manual/local verification

• Agent ran the full @opencode-ai/ui test suite: 90 passed, 0 failed.
• Agent ran the UI package typecheck, repository lint, Prettier check, annotation guard, markdown-table guard, and git diff --check; all passed.
• The pre-push hook ran the cross-package typecheck successfully.

Reviewer test steps

1. Render (~a (~b or (~24 GB) and (~5.7 GB) in a chat message.
2. Confirm the text remains literal and contains no strikethrough.
3. Render ~removed~, ~~removed~~, and (~removed~).
4. Confirm valid strikethrough syntax still renders with a line through removed.

Blocked checks and substitute verification

• None. All relevant checks completed successfully.

Checklist

• Issue linked above, or exception explained
• Tests/verification described
• Screenshots/video included for visual changes, or marked N/A
• Changeset considered for user-facing changes
• I personally reviewed the diff and can explain the changes, including any AI-assisted work.

Get in Touch

thomas07374

[johnnyeric]

Thanks for the fix! Merged.