emmie: fix hunspell and firefox deprecation warnings

hunspellWithDicts -> hunspell.withDicts; pin programs.firefox.configPath
to the legacy .mozilla/firefox so the profile stays put when stateVersion
crosses 26.05.

modules/clan/home-profiles/home-user/emmie.nix

@@ -80,15 +80,12 @@
                 ...
               }:
               let
-                dictionaries =
-                  with pkgs;
-                  (hunspellWithDicts (
-                    with hunspellDicts;
-                    [
-                      en-us-large
-                      th-th
-                    ]
-                  ));
+                dictionaries = pkgs.hunspell.withDicts (
+                  d: with d; [
+                    en-us-large
+                    th-th
+                  ]
+                );
               in
               {
                 imports = [ inputs.plasma-manager.homeModules.plasma-manager ];
@@ -118,6 +115,8 @@
 
                 programs.firefox = {
                   enable = true;
+                  # Keep the pre-26.05 profile location; moving it would orphan the existing profile.
+                  configPath = ".mozilla/firefox";
                 };
 
                 programs.home-manager.enable = true;