v0.3.0

What's Changed

• docs: add mise GitHub backend installation instructions by @rin2yh in #20
• feat(preview): use grab/grabbing cursor while panning by @rin2yh in #22
• feat(preview): pan the diagram with arrow keys by @rin2yh in #23
• feat(preview): make zoom level numeric display editable by @rin2yh in #24
• feat(source-view): fold brace-delimited entity blocks by @rin2yh in #25
• refactor(components): split preview and source-view into directories by @rin2yh in #26
• docs(readme): trim overview bullets and move Background below Usage by @rin2yh in #28
• feat(frontend): adopt React Compiler, drop manual memoization by @rin2yh in #27
• refactor: move server/static/frontend under internal/ and gate CI on paths by @rin2yh in #30
• feat(frontend): abort in-flight fetch on file switch and unmount by @rin2yh in #37

Full Changelog: v0.2.1...v0.3.0