[WIP] Fix installation bugs in Arch Linux setup

[Copilot]

Thanks for asking me to work on this. I will get started on it and keep this PR's description up to date as I form a plan and make progress.

Original prompt

The user encountered several issues after running install.sh for Arch Linux in this repository. Please fix the following bugs:

1. Hyprland config: Fix "invalid keyboard layout passed" and outdated bezier curves. The current config was built for an older Hyprland version (NixOS 25.11 era) and needs to be updated to the latest Hyprland syntax.
2. Zsh config: Fix the "there is no file oh-my zsh" error that appears when opening zsh. Ensure Oh My Zsh is properly sourced or installed.
3. Neovim config: Fix a syntax error in init.lua around line 256 where it says :256, then expected near <eof>.
4. Font installation: The JetBrains font is not installing correctly. Please check and fix the font installation logic (likely in install.sh or related scripts).
5. Weather script: When the .env file is missing, the script fails with ".env file not found". Update the script to output dummy zeros instead of failing when the .env file is not present.

The following is the prior conversation context from the user's chat exploration (may be truncated):

User: I tried to use install.sh for arch linux, and ran into a variety of problems: . 1. hyprland says "invalid keyboard layout passed" and then a lot of wrong bezier curves too (the config i have was built for nix os 25.11 hyprland version, not the newest one. 2. Zsh after opening says "there is no file oh-my zsh", 3. Nvim init lua says ":256, then expected near . And these are all the files you might find relevant to it. Also, the jet brains font wasn't installed correctly. ALso, in the weather script, it says ".env file not found" instead of dummy zeros which is wrong. Fix those all

Assistant: I have prepared a workspace to fix the installation script, Hyprland configuration, Zsh setup, Neovim config, font installation, and weather script issues; please accept the prompt to proceed.

This pull request was created from Copilot chat.