Apply dark theme to all UI pages

- Convert registry list, docker detail, package detail, maven detail pages to dark theme
- Use layout_dark instead of layout for all pages
- Update colors: bg-[#1e293b] cards, slate-700 borders, slate-200/400 text
- Mark unused light theme functions with #[allow(dead_code)]

Cargo.lock

@@ -1185,7 +1185,7 @@ checksum = "38bf9645c8b145698bb0b18a4637dcacbc421ea49bef2317e4fd8065a387cf21"
 
 [[package]]
 name = "nora-cli"
-version = "0.2.7"
+version = "0.2.9"
 dependencies = [
  "clap",
  "flate2",
@@ -1199,7 +1199,7 @@ dependencies = [
 
 [[package]]
 name = "nora-registry"
-version = "0.2.7"
+version = "0.2.9"
 dependencies = [
  "async-trait",
  "axum",
@@ -1234,7 +1234,7 @@ dependencies = [
 
 [[package]]
 name = "nora-storage"
-version = "0.2.7"
+version = "0.2.9"
 dependencies = [
  "axum",
  "base64",