feat(night-mode): 🌙 Switch from wlsunset to hyprsunset and add temperature control

- Replace wlsunset with hyprsunset for better Hyprland integration
- Add temperature adjustment functions with scroll support in Waybar
- Implement persistent temperature storage in `~/.cache/hyprsunset_temp`
- Add temperature bounds (2000K-6500K) with 100K increment/decrement
steps
- Update NixOS configuration to include hyprsunset package

Fixes temperature persistence and improves Hyprland compatibility

home/.config/fish/functions/night_mode_toggle.fish

@@ -1,9 +1,16 @@
 function night_mode_toggle
-    set target_process wlsunset
+    set target_process hyprsunset
+    set temp_file ~/.cache/hyprsunset_temp
 
     if pgrep $target_process >/dev/null
-        killall -s SIGINT wlsunset
+        killall -s SIGINT $target_process
     else
-        wlsunset
+        if test -f $temp_file
+            set temp (cat $temp_file)
+        else
+            set temp 4000
+            echo $temp >$temp_file
+        end
+        $target_process -t $temp
     end
 end