Eric Traut 9477081ccd
Support quoted labels and ampersands in Mermaid flowcharts ( #47678 ) ...
## Why
Flowcharts with labels such as `A["Review & confirm"]` fell back to source display instead of rendering a diagram.
## What changed
Accept double-quoted node and edge labels, strip the surrounding quotes, and allow literal ampersands in flowchart labels. Keep other diagram families' label restrictions and continue rejecting HTML, entity escapes, and malformed quotes.
## Testing
Add parser and renderer regression tests for quoted labels, literal ampersands, statement separators, and unsupported text, plus TUI coverage for rendered labels and entity source fallback.
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Eric Traut
9477081ccd