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feat(shellv2): Support python f-string syntax highlighting#1973

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KCarretto wants to merge 1 commit intomainfrom
fix/shellv2-fstring-highlighting-12046633296892635630
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feat(shellv2): Support python f-string syntax highlighting#1973
KCarretto wants to merge 1 commit intomainfrom
fix/shellv2-fstring-highlighting-12046633296892635630

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@KCarretto
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This pull request enhances the syntax highlighting utility for ShellV2 (highlightPythonSyntax) by adding support for Python f-strings (f"..."). Previously, f-strings and their inner variable braces were highlighted strictly as literal text.

The regular expression rules were updated to capture f-strings explicitly before regular strings. When an f-string is found, it performs a targeted replacement of the {...} brace expressions, calling the highlighting function recursively on their contents to ensure numbers, variables, and keywords are colored appropriately, while leaving escaped braces ({{ }}) intact. This aligns the shell's feedback with standard Python developer expectations. Included accompanying test suites verify all additions.


PR created automatically by Jules for task 12046633296892635630 started by @KCarretto

- Update the regex array in `highlightPythonSyntax` (`shellUtils.ts`) to match `f"..."` and `f'...'` strings separately.
- For matched f-strings, extract inner expressions enclosed in `{}` braces while properly escaping double braces (`{{` and `}}`).
- Recursively apply `highlightPythonSyntax` to the contents of the `{}` braces and color the braces themselves as punctuation.
- Add comprehensive test cases to `shellUtils.test.ts` to verify basic highlighting, nested numbers/expressions, and escaped braces work as expected.

Co-authored-by: KCarretto <16250309+KCarretto@users.noreply.github.com>
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