Add qt6-tools to Arch Linux installation instructions

[everythxxgs]

I tried to install on my arch linux i had a issue installing qt6-tools fixed it :)

The error i got

```txt CMake Error at CMakeLists.txt:7 (find_package): Found package configuration file: /usr/lib/cmake/Qt6/Qt6Config.cmake

but it set Qt6_FOUND to FALSE so package "Qt6" is considered to be NOT
FOUND. Reason given by package:

Failed to find required Qt component "LinguistTools".

Expected Config file at
"/usr/lib/cmake/Qt6LinguistTools/Qt6LinguistToolsConfig.cmake" does NOT
exist

Configuring with --debug-find-pkg=Qt6LinguistTools might reveal details why
the package was not found.

Configuring with -DQT_DEBUG_FIND_PACKAGE=ON will print the values of some
of the path variables that find_package uses to try and find the package. ```

Summary by CodeRabbit

• Documentation
  • Updated Arch Linux installation instructions to include the qt6-tools package in the required dependencies.

<sub>✏️ Tip: You can customize this high-level summary in your review settings.</sub>

[coderabbitai]

📝 Walkthrough

Walkthrough

Updated Arch Linux installation instructions in README to add qt6-tools to the pacman package installation command. The package list now includes qt6-base, qt6-connectivity, qt6-multimedia-ffmpeg, qt6-multimedia, and qt6-tools.

Changes

Cohort / File(s)	Change Summary
Linux Setup Instructions linux/README.md	Added qt6-tools to Arch Linux pacman package installation command

Pre-merge checks and finishing touches

✅ Passed checks (3 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title directly and accurately describes the main change: adding qt6-tools to the Arch Linux installation instructions in the README file.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.

✨ Finishing touches

• 📝 Generate docstrings

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Post copyable unit tests in a comment

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