refactor: resolve merge conflicts — combine main improvements with token normalization

- .gitignore: keep both graphify-out/ entries and main's .gitnexus entry
- ScriptCodeBlock/ScriptPreviewModal: take main's border-border and text-accent-text
  for filename labels; use neutral ghost style for Save button in ScriptCodeBlock;
  use bg-accent (normalized from bg-primary) for Save button in ScriptPreviewModal

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

.gitignore

@@ -233,6 +233,7 @@ package.json
 package-lock.json
 .worktrees/
 .gstack/
+.gitnexus
 
 # graphify knowledge graph outputs
 graphify-out/