Release v2.30.0

What's Changed

• feat(gui): keep unsaved work-brief edits through navigation and reloads by @antan87 in #342
• chore: prepare release 2.30.0 by @antan87 in #345
• perf: measured scale baseline, performance rules and six targeted fixes by @antan87 in #325
• chore(release): refuse stale versions and unverified sources at the guard by @antan87 in #343

Full Changelog: v2.29.1...v2.30.0