Cardano Updates

chore(nix): bump cardano-node to 10.6.4

Upgrade cardano-node from 10.6.2 to 10.7.1 and configure the V2LSM
ledger backend to reduce memory usage by storing UTxO data on disk
rather than in-heap. Also updates the cardano-playground config pin
and switches the config path to environments-pre/.

fix(node-logs): support ISO 8601 Z timezone suffix in log timestamp

cardano-tracer changed the log timestamp format from
"[YYYY-MM-DD HH:mm:ss.SSS UTC]" to "[YYYY-MM-DD HH:mm:ss.SSSZ]",
causing isItFreshLog to never match and ledger replay progress to
remain stuck at 0.00%.

(cherry picked from commit df4d8a52a9eec014142f2c56dbd5e1da76cfc7e0)

- Derive Mithril and chain-storage tokens from each runtime theme.

- Derive weight combined download progress by actual transfer sizes.

- Refresh selector styles and add missing font and spinner imports.

- Derive Mithril and chain-storage tokens from each runtime theme.

- Derive weight combined download progress by actual transfer sizes.

- Refresh selector styles and add missing font and spinner imports.

Upgrade cardano-node from 10.6.2 to 10.7.1 and configure the V2LSM
ledger backend to reduce memory usage by storing UTxO data on disk
rather than in-heap. Also updates the cardano-playground config pin
and switches the config path to environments-pre/.

docs(readme): add license badge

Fix chain storage path handling and enhance validation

- reject nested managed-chain selections and default-path symlink aliases
- require cardano-node to be fully stopped before destructive storage changes
- prevent selfnode config failures from mutating chain storage
- make Mithril status delivery resilient to renderer failures and window recreation
- preserve invalid picker paths, surface apply/reset failures, and serialize return-to-storage cleanup
- clear transient Mithril state on preparing/cancelled and document the review-driven fixes

Daedalus 7.3.0