style: change game launcher menu to mimic Steam Deck UI and improve UX

[RanMd]

Update Rofi theme to resemble Steam Deck style, including visual tweaks and the addition of Vim-style motions for improved navigation. Adjust launcher script parameters to support the new UI.

Description

This pull request updates the game launcher menu to improve usability and visual consistency. The following changes were made:

• The Rofi theme was modified to more closely resemble the Steam Deck interface.
• Vim-style gestures were added to the menu for those who prefer keyboard navigation. (The default controls are still present.)
• The game launcher script was adjusted to be compatible with the updated interface.
• Some lines in the theme that seemed to have no impact were removed (It works for me, but it needs to be tested).
• A flatpak package check was added to eliminate the "flatpak command not found" error.

Type of change

Please put an x in the boxes that apply:

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• Documentation update (non-breaking change; modified files are limited to the documentations)
• Technical debt (a code change that does not fix a bug or add a feature but makes something clearer for devs)
• Other (provide details below)

Checklist

Please put an x in the boxes that apply:

• I have read the CONTRIBUTING document.
• My code follows the code style of this project.
• My commit message follows the commit guidelines.
• My change requires a change to the documentation.
• I have updated the documentation accordingly.
• I have added a changelog entry.
• I have added necessary comments/documentation to my code.
• I have added tests to cover my changes.
• I have tested my code locally and it works as expected.
• All new and existing tests passed.

Screenshots

New look

[kRHYME7]

Hello @RanMd Looks good to me but i don't want to suddenly nuke the option for gamelauncher_5 that being said I suggest we add Steam Deck option for the gamelauncher, this will be a separate theme. And maybe we can add it as a default in gamelauncher script.

[RanMd]

Hi bro, my intention was to give it a more Steam Deck-like feel since the original design inspired that, so I thought about modifying that specific theme. Your opinion is very good, but for me it would be weird to have two very similar ones. I don't know what you think. If anything, I'll change it, let me know, bro.

[kRHYME7]

Your opinion is very good, but for me it would be weird to have two very similar ones. I don't know what you think. If anything, I'll change it, let me know, bro.

I understand, but because HyDE is a sort of superset of hyprdots we tried to at least preserve some parts of it . Example gamelauncher_5, but I really hate the naming because it is not that descriptive at all. Now that this new menu is here and even better than gamelauncher_5, I would like to make it as a default and with a good descriptive name like steam deck or sort of while preserving the gamelauncher_5 theme.

[RanMd]

Okay bro, I already made the changes, I just noticed a part in the /.local/share/rofi/themes directory where the symbolic links are, but I don't know if I should add the new theme (steam_deck.rasi) somewhere so that the link is automatically created when restoring the configuration.

[kRHYME7]

Merging this then! Thank you!

I just noticed a part in the /.local/share/rofi/themes directory where the symbolic links are, but I don't know if I should add the new theme (steam_deck.rasi) somewhere so that the link is

There's a small hook to populate it in swwwallcache.sh