#3761)

The \slashed -> \not cases (#3750) wrote their braced inputs with a
double backslash (\slashed{p}); real model output is a single one. The
regex matched either way so the tests passed, but they exercised a form
the model never emits. Switch them to single-backslash inputs and the
eq() helper the surrounding golden tests already use.

Co-authored-by: reasonix <reasonix@deepseek.com>

…ine#3750)

* fix(desktop): convert \\slashed to \\not for KaTeX compatibility

KaTeX doesn't support the \\slashed command from the LaTeX 'slashed'
package, which is commonly used in physics for Feynman slash notation
(\\slashed{p}, \\slashed{\\partial}).

Convert \\slashed{X} to \\not{X} before passing to KaTeX. The \\not
command provides a similar visual effect (a slash through the character)
and is supported by KaTeX.

This prevents KaTeX parse errors when the model emits physics notation
using \\slashed.

Tests: 3 new cases added, 111/111 passing

* fix(desktop): handle unbraced \\\\slashed forms like \\\\slashed\\\\epsilon(0)

The previous fix only handled \\\\slashed{X} (braced form). User-reported
issue: \\\\slashed\\\\epsilon(0) (Greek letter + function call, no braces)
was not being converted and still showed as red KaTeX error.

Extended the regex to handle two additional forms:
- \\\\slashed X       → \\\\not X       (single letter, no braces)
- \\\\slashed\\\\epsilon      → \\\\not{\\\\epsilon}    (backslash command)
- \\\\slashed\\\\epsilon(0)   → \\\\not{\\\\epsilon(0)}  (backslash command + function)
- \\\\slashed a       → \\\\not a       (single ASCII letter)

This covers the common physics notation \\\\slashed{p} where the model
sometimes forgets the braces around the argument.

Tests: 2 new cases added, 113/113 math-golden passing.

---------

Co-authored-by: Xingbo Zhao <xbzhao@impcas.ac.cn>

esengine#3761)

The \slashed -> \not cases (esengine#3750) wrote their braced inputs with a
double backslash (\slashed{p}); real model output is a single one. The
regex matched either way so the tests passed, but they exercised a form
the model never emits. Switch them to single-backslash inputs and the
eq() helper the surrounding golden tests already use.

Co-authored-by: reasonix <reasonix@deepseek.com>