Render ebook metadata as plain text

[dlpwaters]

Summary

• force EPUB and sidecar title, author, and dynamic status values through Text.PlainText in the native library panel
• keep all book metadata out of the shared Omarchy AutoText tooltip boundary
• add a regression test covering every current untrusted QML text sink
• explicitly describe Night as dark mode in the README appearance gallery
• bump Leaf Reader to v1.1.2

Verification

• 11 Python tests pass
• QML lint passes for BarWidget.qml, Panel.qml, and ReaderApp.qml
• JavaScript syntax checks pass
• Omarchy plugin validation passes
• git diff --check passes