Bump version to 0.1.1 (package.json, Cargo.toml, Cargo.lock), date the
changelog section (2026-06-23), and add the GitHub release-notes draft.
QoL release on top of 0.1.0: custom multi-folder picker, theme system,
timeline scrubber, folder reordering, gallery/duplicate-finder
virtualisation, video playback settings, rebuild-semantic-index action,
plus AVIF thumbnail, video-embedding, and Subtle Light theme fixes.
