* fix(web): make mermaid sanitizer quote-aware and detect parens in bracket labels
Two diagrams failed to render because sanitizeMermaidCode injected nested
quotes into already-quoted labels and missed parens-as-stadium-opener inside
bracket labels. Skip ranges already inside `"..."` (recomputed between
passes) and add `(`/`)` to the bracket-pass trigger set.
* refactor(web): drop dead text.startsWith('"') guards in mermaid sanitizer
The regex character classes [^\]"], [^|"], [^)"] already exclude `"`,
so the guards were unreachable.
* fix(web): stop unterminated quote bleeding across lines in mermaid sanitizer
findQuotedRanges now stops scanning at newline; an unterminated `"` is
discarded rather than paired with a `"` on a later line where it would
silently suppress sanitization of unrelated content. Add tests for the
cross-line guard and for a bracket-with-parens adjacent to a real
stadium node on the same line.
José Almeida
692fdddcc9