Merge main and apply PR #528 translation changes

Resolve merge conflicts by preserving earlier translation PR content
and applying only PR #528 specific changes:
- jax_intro.md: Restructure JIT section, add timer comments
- numba.md: Change int(n) to n
- numpy_vs_numba_vs_jax.md: Simplify parallel Numba section, update timers

Co-authored-by: HumphreyYang <39026988+HumphreyYang@users.noreply.github.com>

Author: Copilot

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@@ -0,0 +1,6 @@
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.translate/state/need_for_speed.md.yml

@@ -1,6 +1,6 @@
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.translate/state/pandas.md.yml

@@ -1,6 +1,6 @@
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.translate/state/python_advanced_features.md.yml

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lectures/_toc.yml

@@ -25,6 +25,7 @@ parts:
   - file: numba
   - file: jax_intro
   - file: numpy_vs_numba_vs_jax
+  - file: autodiff
 - caption: Working with Data
   numbered: true
   chapters: