[SandObserver]

Summary

• Set dir="auto" on .ilabel, .dyn-mob-label, .dyn-fold-label and .dyn-fold-inner-label at each creation site, so a label takes its direction from the name it holds and ellipsises at that name's end.
• unicode-bidi:plaintext moves the cut in Blink but is ignored by WebKit, where the label was clipped at both ends. The labels are centred, so dir cannot move them off their icons.
• Covers tile labels, folder labels and names inside an open folder, on the desktop and phone layouts.
• Add a check that every one of those labels carries the attribute, and a check that all four rules stay centred, which is what makes the attribute safe.

Testing
All green, plus the Docker build. Added 2 tests, verified to fail without the change, and confirmed the rendering in WebKit and Blink against a container.

Checklist

• Stays within the project constraints: one container, no runtime dependencies, no build step (see CONTRIBUTING.md).
• Tests added or updated for new logic, and the full suite, lint, and typechecks pass.
• Docs updated if behavior or configuration changed.
• CHANGELOG.md updated under Unreleased if the change is user-visible.