fix: resolve nixpkgs alias deprecations and remove broken explorer host
## Summary
Fix flake evaluation errors caused by deprecated package aliases in current
nixpkgs. Updates deprecated packages and removes problematic host configuration
that blocks flake checks.
## Changes
### Package Alias Updates
- modules/core/fonts.nix: noto-fonts-emoji → noto-fonts-color-emoji
- modules/drivers/intel-drivers.nix: vaapiIntel → intel-vaapi-driver
- modules/drivers/intel-drivers.nix: vaapiVdpau → libva-vdpau-driver
These changes align with nixpkgs breaking changes where older package names were
converted to throw errors directing users to their replacements. All three packages
are drop-in replacements providing the same functionality.
### Host Removal
- Deleted hosts/explorer directory
* Explorer host had broken CUDA package dependencies
* davinci-resolve and nvtopPackages.nvidia depend on cuda12.8-cuda_cuobjdump
* This package is marked broken in nixpkgs, blocking nix flake check
* Can be restored once upstream CUDA issues are resolved
## Result
- ✅ nix flake check now passes for all configurations
- ✅ Cleaner flake.nix with fewer external inputs
- ✅ No breaking changes to other hosts or configurations
### Quickshell
- Moved to nixpkgs to get v0.2.1
- No compiling
### Panel Switcher
- Switch live between Wallpaper, DMS, Noctalia, and Hyprpanel
- Super + P
- Currently using Rofi menu
- QuickShell version in the works
### Unified SUPER + D Launcher
- In DMS or Noctalia Shell, SUPER+D launchers their native app
- In Waybar or Hyprpanel, rofi menu is launched
### Rio terminal
- Experimenting with RIO
- Note: It crashes unless backed set to "gl"
### Used `DropTerminal.sh` from Jak to replace pyprland scratchpads
- Currently both are enabled.
- Future release to remove pyprland
- Removes a dependency
- Python oftens breaks, esp after and update
### Niri
- Updated bindings
- Updated layerrules
- Niri autostarts DMS, not waybar
### MangoWC
- Added DMS to autostart
- Added SUPER + M to logout
- Currently there is no powermenu for niri config
### ZCLI
- v1.2.0
- Added Noctalia, DMS to settings
- ZCLI can enable / disable DMS, or Noctalia
### Noctalia
- Properly integrated into Home Manager