Updates installation instructions for Spark/aarch64

[myurasov-nv]

Description

Updates installation instructions for aarch64 (Spark) to include Python 3.12 dev headers that are needed for quadprog.

Feature Type

Documentation change.

Checklist

• I have read and understood the contribution guidelines
• I have run the pre-commit checks with ./isaaclab.sh --format
• [ x I have made corresponding changes to the documentation
• My changes generate no new warnings
• [NA] I have added tests that prove my fix is effective or that my feature works
• [NA] I have updated the changelog and the corresponding version in the extension's config/extension.toml file
• I have added my name to the CONTRIBUTORS.md or my name already exists there

[greptile-apps]

Greptile Summary

This PR is a documentation-only change that consistently updates four installation guide files to reflect that quadprog (in addition to the previously documented imgui-bundle) requires compilation from source on aarch64 systems (e.g., DGX Spark), and therefore that python3.12-dev must be installed as a build prerequisite alongside the existing OpenGL/X11 packages.

• All four affected .rst files receive identical, coherent changes: quadprog is added to the prose, python3.12-dev is prepended to the apt install command, and the description is updated to mention Python dev headers.
• Minor gap: the "Without these packages, the build will fail with a CMake error…" sentence in index.rst was not updated to describe the distinct error that occurs when python3.12-dev is missing (a C compiler error about missing Python.h, not a CMake/OpenGL error).
• The python3.12-dev package name is version-pinned to Python 3.12; if the platform Python version ever changes, the documentation will silently point users to the wrong dev headers.

Confidence Score: 5/5

• Documentation-only change with no code impact; safe to merge.
• All changes are strictly documentation. The updates are consistent across every affected file and the added apt package is correct for the stated purpose. The two style-level observations (incomplete error description, hardcoded Python version) are minor and do not block correctness.
• docs/source/setup/installation/index.rst — the "Without these packages" error description should ideally be extended to cover the Python-header failure case.

Important Files Changed

Filename	Overview
docs/source/setup/installation/index.rst	Adds python3.12-dev to the aarch64 apt prerequisite list and mentions quadprog alongside imgui-bundle; the "Without these packages" error description was not updated to cover the Python-header failure case.
docs/source/setup/installation/include/src_build_isaaclab.rst	Consistent update: adds python3.12-dev to the apt command and mentions quadprog in the prose. Python version is hardcoded to 3.12.
docs/source/setup/installation/pip_installation.rst	Consistent update mirroring the same changes as the other installation docs for the aarch64 note.
docs/source/setup/installation/isaaclab_pip_installation.rst	Consistent update mirroring the same changes as the other installation docs for the aarch64 note.

Flowchart

%%{init: {'theme': 'neutral'}}%%
flowchart TD
    A[Start aarch64 / DGX Spark Installation] --> B{Are prerequisites installed?}
    B -- No --> C[sudo apt install python3.12-dev\nlibgl1-mesa-dev libx11-dev\nlibxcursor-dev libxi-dev\nlibxinerama-dev libxrandr-dev]
    C --> D[Prerequisites ready]
    B -- Yes --> D
    D --> E[pip install Isaac Lab]
    E --> F{Build from source needed?}
    F -- imgui-bundle --> G[Compile imgui-bundle\nRequires OpenGL + X11 headers]
    F -- quadprog --> H[Compile quadprog\nRequires Python 3.12 dev headers]
    G --> I[Installation Complete]
    H --> I

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_{Last reviewed commit: b1b2d52}