Configure nvim-tree to hide macOS system files

- Add custom filter patterns for common macOS system files
- Hide .DS_Store, .AppleDouble, .LSOverride, and other system files
- Include resource forks (._*), Spotlight, and Time Machine files
- Keep existing dotfiles and git_ignored filter settings
- Maintain clean file explorer interface without system clutter

🤖 Generated with [Claude Code](https://claude.ai/code)

Co-Authored-By: Claude <noreply@anthropic.com>

modules/nvim.nix

@@ -193,8 +193,21 @@
         filters = {
           dotfiles = true,      -- Hide dotfiles by default (H to toggle)
           git_ignored = false,  -- Show gitignored files by default (I to toggle)
+          custom = {            -- Hide macOS system files
+            ".DS_Store",
+            ".AppleDouble",
+            ".LSOverride",
+            "._.*",
+            ".DocumentRevisions-V100",
+            ".fseventsd",
+            ".Spotlight-V100",
+            ".TemporaryItems",
+            ".Trashes",
+            ".VolumeIcon.icns",
+            ".com.apple.timemachine.donotpresent",
+          },
         },
       })
     '';
   };
-}
+}