chore(flakes): update Flake lockfile and configs

- Updated multiple Flake lockfile entries to the latest revisions for improved consistency with upstream changes.
- Removed redundant `sshKey` fields from builder configurations in `nixbuild.nix`.
- Added `Nix` path initialization for fish shell SSH sessions and refactored mouse bindings in `default.nix`.

homes/aarch64-darwin/harald@rialo/default.nix

@@ -1,15 +1,16 @@
-{ pkgs
-, config
-, ...
+{
+  pkgs,
+  config,
+  ...
 }:
 {
   home = {
     username = "harald";
     homeDirectory = "/Users/${config.home.username}";
     stateVersion = "23.11"; # Please read the comment before changing.
-    sessionPath = [
-      "$HOME/Library/Application Support/JetBrains/Toolbox/scripts/"
-    ];
+    #    sessionPath = [
+    #      "$HOME/Library/Application Support/JetBrains/Toolbox/scripts/"
+    #    ];
   };
 
   metacfg = {
@@ -40,7 +41,10 @@
 
         selection.save_to_clipboard = true;
         mouse.bindings = [
-          { mouse = "Middle"; action = "Paste"; }
+          {
+            mouse = "Middle";
+            action = "Paste";
+          }
         ];
 
         # Color theme ported from iTerm 2 Smoooooth