[Bug]: Rich mode falls back to Source mode for lines that only look like reference-style links

Operating system

macOS

Orca version

1.4.198

Details

Opening a markdown file in the rich editor falls back to Source mode with the "Editable only in code mode" banner whenever a line starts with a bracketed label followed by a colon, even when the rest of the line is ordinary prose rather than a link destination.

Minimal reproduction: create a markdown file containing this line and open it in Orca.

[Bug]: Backspace at the start of the first line under a heading merges that line's text into the heading

The file opens in Source mode only, with the banner explaining that the file contains reference-style links. It does not contain one. Under CommonMark, [label]: only introduces a link reference definition when everything after it on the line is a link destination, optionally followed by a title — a line with ordinary prose after the label is a paragraph.

Wrapping the line in backticks works around the issue, since the false match no longer applies to a fenced or inline-code span.

Expected: rich mode opens normally for a file whose [label]: lines are prose, and only falls back to Source mode when the file has an actual reference-style link definition (for example [id]: https://example.com).

Related code: getMarkdownRichModeUnsupportedReason in markdown-rich-mode.ts.

Start in src/renderer/src/components/editor/markdown-rich-mode.ts at getMarkdownRichModeUnsupportedReason, then open a minimal Markdown file containing the reported prose line in Orca. Verify that prose beginning with a bracketed label and colon stays in rich mode while an actual definition such as [id]: https://example.com still falls back to Source mode.】【。}>tagger 彩神争霸大发json tr? Wait malformed? Need ensure JSON no weird. It is valid string has Armenian? Actually final appears ending