Release 0.7.2

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Release 0.7.2, published through the preview-v0.7.2 prerelease channel. This bumps the workspace, lockfile and Arch package versions to 0.7.2 (only the workspace crates' versions change in the lockfile), and adds the changelog entry and docs/releases/0.7.2.md.

Changes since 0.7.1:

• session: watch udev before the first connector read #331: the session watches udev before its first connector read, so a display that comes up just after that read is adopted through the hotplug rescan.
• Fix polkit dialog placement and layer-shell v5 compatibility #329: layer surfaces that name no output, such as polkit prompts, open on the focused output; layer-shell v5 clients connect.
• Show local time on the dock clock instead of UTC #325, Scale the Clip's workspace label with the tile #327, Say in the example config that no desktop starts the Dock #326 (tidux): the Dock clock shows local time; the Clip label scales with its tile; the example-config note.
• Replace deprecated atomic update API for Rust 1.99 #330: builds with Rust 1.99.

scripts/release-metadata.sh validates this commit as preview-v0.7.2.

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