feat: add vicinae-extensions and update vicinae settings

Add vicinae-extensions flake input and configure extensions (bluetooth,
nix, power-profile). Move vicinae cache config from system.nix to
cachix.nix. Update vicinae settings to new config schema with systemd
autostart.

Co-Authored-By: Claude Sonnet 4.6 <[email protected]>

modules/home/vicinae.nix

@@ -1,23 +1,50 @@
-{ inputs, ... }:
 {
+  inputs,
+  pkgs,
+  ...
+}: {
   imports = [
     inputs.vicinae.homeManagerModules.default
   ];
 
   services.vicinae = {
     enable = true;
-    # package = [ ];
+    systemd = {
+      enable = true;
+      autoStart = true;
+      environment = {
+        USE_LAYER_SHELL = 1;
+      };
+    };
+
     settings = {
-      faviconService = "twenty"; # twenty | google | none
       font.size = 11;
-      popToRootOnClose = false;
-      rootSearch.searchFiles = false;
-      theme.name = "dracula";
+      close_on_focus_loss = true;
+      consider_preedit = true;
+      pop_to_root_on_close = true;
+      favicon_service = "twenty";
+      search_files_in_root = true;
+      theme = {
+        light = {
+          name = "dracula";
+          icon_theme = "default";
+        };
+        dark = {
+          name = "vicinae-light";
+          icon_theme = "default";
+        };
+      };
       window = {
         csd = true;
         opacity = 0.95;
         rounding = 10;
       };
     };
+    extensions = with inputs.vicinae-extensions.packages.${pkgs.stdenv.hostPlatform.system}; [
+      bluetooth
+      nix
+      power-profile
+      # Extension names can be found in the link below, it's just the folder names
+    ];
   };
 }