Remove Splash syntax highlighter dependencyremove-splash-highlighter

Splash only highlights Swift, leaving every other language unhighlighted.
Drop the dependency entirely and render file contents as plain text until a
broader-coverage highlighter is adopted.

- Remove `import Splash` and the Splash-backed theming in FileTreeView
- Simplify CodeSyntaxHighlighter to emit plain attributed text
- Remove the Splash SwiftPM package reference and product dependency

Refs https://github.com/zerolabsco/hutch/issues/16

Co-Authored-By: Claude Opus 4.8 <[email protected]>

1 files changed, 0 insertions, 9 deletions

diff --git a/Hutch.xcodeproj/project.xcworkspace/xcshareddata/swiftpm/Package.resolved b/Hutch.xcodeproj/project.xcworkspace/xcshareddata/swiftpm/Package.resolved
index 55263b9..417e4d7 100644
--- a/Hutch.xcodeproj/project.xcworkspace/xcshareddata/swiftpm/Package.resolved
+++ b/Hutch.xcodeproj/project.xcworkspace/xcshareddata/swiftpm/Package.resolved
@@ -2,15 +2,6 @@
   "originHash" : "65542d8a5fbbad8dd7d07c8901c1cc48b3aba12cef8da1f062bd28d9b3a6ba50",
   "pins" : [
     {
-      "identity" : "splash",
-      "kind" : "remoteSourceControl",
-      "location" : "https://github.com/JohnSundell/Splash",
-      "state" : {
-        "revision" : "7f4df436eb78fe64fe2c32c58006e9949fa28ad8",
-        "version" : "0.16.0"
-      }
-    },
-    {
       "identity" : "swift-cmark",
       "kind" : "remoteSourceControl",
       "location" : "https://github.com/swiftlang/swift-cmark.git",