feat: add LaTeX fragment preview in org-mode via Kitty graphics

C-c C-x C-l now renders LaTeX fragments as images in terminal Emacs.
Bypasses org's display-graphic-p guard since the latex+dvipng pipeline
works fine without a GUI.

- Advise org-latex-preview to handle terminal color fallbacks
  (unspecified-fg -> Black) and suppress clear-image-cache
- Advise org--make-preview-overlay to display generated PNGs via
  kitty-gfx-display-image instead of Emacs image specs
- Add kitty-gfx--org-clear-latex-preview for C-u cleanup
- Add LaTeX test fragments to test-kitty-gfx.org

1 files changed, 12 insertions, 0 deletions

diff --git a/tests/test-kitty-gfx.org b/tests/test-kitty-gfx.org
index 4b34193..5d746ea 100644
--- a/tests/test-kitty-gfx.org
+++ b/tests/test-kitty-gfx.org
@@ -27,4 +27,16 @@ Line 10
 
 [[./test-image.png]]
 
+* LaTeX fragment preview test
+
+Inline math: $E = mc^2$
+
+Display math:
+
+\begin{equation}
+\int_0^\infty e^{-x^2} dx = \frac{\sqrt{\pi}}{2}
+\end{equation}
+
+Another inline: $\sum_{i=1}^{n} i = \frac{n(n+1)}{2}$
+
 End of test file.