fix(license): use QUrl.toLocalFile; track docs folder

- QUrl.toLocalFile() prevents leading slash on Windows drive letters (e.g.
  "/C:/Users/...") that was causing Path operations to fail
- remove docs/ from .gitignore so document revisions are tracked in Git

.gitignore

@@ -21,7 +21,6 @@ env/
 *.swp
 *.swo
 *~
-docs
 
 # OS
 .DS_Store
@@ -56,3 +55,4 @@ AGENTS.md
 CONVENTIONS.md
 specs/
 graphify-out/
+.personal-docs/