Cardano Updates

Align lockfile with the staging branch baseline for reproducible installs
and CONTRIBUTING guidance.

Made-with: Cursor

Backport: revert `ConwayAccountState` type unrolling

Remove redundant entry from sidebar and streamline internal links in the Developer Pathway overview. Adjust description for clarity and enhance the diagram's click targets for better navigation. Update styles for the Mermaid diagram viewport to improve responsiveness and visual consistency across themes.

This also requires setting the decentralisation parameter `ppD` to `< 1`
so pools can produce blocks as well. We set it to `minBound` which means
that the network is full decentralised.

See: #5477

Add a `prestart` script to package.json that runs `prisma migrate deploy`
before `next start`, ensuring all database tables exist. Also wrap the
informational User lookup in getNonce with a try/catch so nonce generation
doesn't fail if the User table is temporarily unavailable.

https://claude.ai/code/session_01Y4mDygMY7HNHAJz7GUs5dz

White canvas in light mode; site dark background in dark mode.

Stretch the diagram to 100% of the frame width (not Mermaid intrinsic
px size) so default size matches fenced Mermaid in markdown. Widen
viewport min/max height for a larger scroll area.

Add MermaidDiagramFrame with full screen API, zoom +/- and 1:1 reset,
and Ctrl/Cmd+scroll zoom over the diagram viewport. Move diagram source
to developer-pathway-chart and render via @theme/Mermaid in overview.mdx.

Treat DEFAULT_ZOOM (1.55x) as 100% in the toolbar; reset returns there.
Enlarge percentage typography (1.25rem, bold).

Introduce MermaidDiagramFrame using @theme/Mermaid with toolbar zoom,
reset, Ctrl/Cmd+wheel zoom, and fullscreen. Move diagram source to
src/data/developer-pathway-chart.js; convert overview to MDX.

Add overview with Mermaid pathway map, internal click targets to
on-page anchors, deep-link sections, and Explore further links.
Register Developer Pathway as first item under Get Started sidebar.

Bumps [actions/checkout](https://github.com/actions/checkout) from 4 to 6.
- [Release notes](https://github.com/actions/checkout/releases)
- [Changelog](https://github.com/actions/checkout/blob/main/CHANGELOG.md)
- [Commits](https://github.com/actions/checkout/compare/v4...v6)

---
updated-dependencies:
- dependency-name: actions/checkout
  dependency-version: '6'
  dependency-type: direct:production
  update-type: version-update:semver-major
...

Signed-off-by: dependabot[bot] <[email protected]>

From https://github.com/intersectmbo/cardano-ledger at b9b542043571fa9c83a1f86ea79a09a76def372f