Apply relativeToCwd to tool step preview content and file path inputs

previewContent in ToolStepRow (the 2-line result snippet shown below the
label) was rendering raw paths from tool output. file_path inputs for
Read, Write and Edit in ToolInputDetailView were also showing full paths.
Apply relativeToCwd consistently in both places.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

Author: mcintyre94

Wisp/Views/SpriteDetail/Chat/ToolInputDetailView.swift

@@ -44,15 +44,15 @@ struct ToolInputDetailView: View {
             Text(label)
                 .font(.caption2)
                 .foregroundStyle(.secondary)
-            Text(input["file_path"]?.stringValue ?? "")
+            Text((input["file_path"]?.stringValue ?? "").relativeToCwd(workingDirectory))
                 .font(.system(.caption, design: .monospaced))
                 .textSelection(.enabled)
         }
     }
 
     private var writeInput: some View {
         VStack(alignment: .leading, spacing: 4) {
-            Text(input["file_path"]?.stringValue ?? "")
+            Text((input["file_path"]?.stringValue ?? "").relativeToCwd(workingDirectory))
                 .font(.system(.caption, design: .monospaced))
                 .foregroundStyle(.secondary)
 
@@ -67,7 +67,7 @@ struct ToolInputDetailView: View {
 
     private var editInput: some View {
         VStack(alignment: .leading, spacing: 4) {
-            Text(input["file_path"]?.stringValue ?? "")
+            Text((input["file_path"]?.stringValue ?? "").relativeToCwd(workingDirectory))
                 .font(.system(.caption, design: .monospaced))
                 .foregroundStyle(.secondary)
 

Wisp/Views/SpriteDetail/Chat/ToolStepRow.swift

@@ -34,7 +34,7 @@ struct ToolStepRow: View {
                 }
 
                 if let preview = card.result?.previewContent {
-                    Text(preview)
+                    Text(preview.relativeToCwd(workingDirectory))
                         .font(.system(.caption2, design: .monospaced))
                         .foregroundStyle(.tertiary)
                         .lineLimit(2)