Cardano Updates

added:
* github:input-output-hk/mithril/e0ad33fc9af51e9cd85e6a3db3a7ddea6fa49cab#mithril-client-cli
* github:input-output-hk/mithril/e0ad33fc9af51e9cd85e6a3db3a7ddea6fa49cab#mithril-signer
removed:
* github:cardano-foundation/cardano-wallet/5b81c96360ef9398844bd5c018a5ddd5c370dbaa#packages.x86_64-linux.cardano-address
* github:cardano-foundation/cardano-wallet/5b81c96360ef9398844bd5c018a5ddd5c370dbaa#packages.x86_64-linux.cardano-wallet
* github:cardano-foundation/cardano-wallet/a4a3225cc519cecbcf096d142a11e9ab007ad1b5#packages.x86_64-linux.cardano-address
* github:cardano-foundation/cardano-wallet/a4a3225cc519cecbcf096d142a11e9ab007ad1b5#packages.x86_64-linux.cardano-wallet
* github:input-output-hk/mithril/945c12f7f013426d1d51be9dae9fa4c41a3c3163#mithril-client-cli
* github:input-output-hk/mithril/945c12f7f013426d1d51be9dae9fa4c41a3c3163#mithril-signer

Signed-off-by: Eric Torreborre <[email protected]>

The field was hardcoded to null across all eras since the
update-proposal handling was removed in #1372. Always-null fields
are noise; drop the key entirely and regenerate the goldens.

The 7-way ShelleyBasedEra case duplicated body/mAuxData extraction and
a near-identical field list (with Null placeholders) in every branch.
Extract one helper per feature (validityRangePair, mintPair,
collateralInputsPair, requiredSignersPair, referenceInputsPair,
totalCollateralPair, returnCollateralPair) plus
alonzoScriptWitnessPairsFor / conwayBodyPairsFor. The top-level body
now extracts body/mAuxData once and composes a flat list of pairs.

No behaviour change: all golden outputs are unchanged.

friendlyTx and friendlyTxBody now take ShelleyBasedEra era (instead of
Exp.Era era), accepting Exp.SignedTx era / Exp.UnsignedTx
(ShelleyLedgerEra era). This unblocks transaction view for pre-Conway
tx files.

friendlyTxBodyImpl dispatches on ShelleyBasedEra at the top level and
each branch renders its full body inline. Era-gated fields (mint,
collateral, reference inputs, governance actions, etc.) are present
only in branches whose era supports them.

The eon-based dispatchers (forShelleyBasedEraInEon, AlonzoEraOnwards,
ConwayEraOnwards, ...) are no longer used in this module.

friendlyTx and friendlyTxBody now take Exp.SignedTx / Exp.UnsignedTx
instead of the old Tx / TxBody. friendlyTxBodyImpl reads every field
directly from the ledger TxBody via lenses, so the old TxBodyContent
constructor and getTxBodyContent are no longer used in this module.

Bump CHaP index-state to pick up cardano-api 11.1.0.0, which contains
the widening of Exp.SignedTx to all Shelley-based eras (PR #1199) used
by the friendly rendering work in this branch.

    Closed ──PartialFanout──────────► FanoutProgress
    FanoutProgress ──PartialFanout──► FanoutProgress  (repeat)
    FanoutProgress ──FinalPartialFanout──────────────► Final (burns tokens)
    Closed ──Fanout──────────────────────────────────► Final (≤ threshold, unchanged)

  Off-chain, HeadLogic.emitNextFanoutStep now distinguishes FreshFanout from
  FanoutInProgress to select the correct tx builder at each step.

* add: stablecoins page

* add: add og image

* fix: usdcx url

* add: coin fetching fallback documentation

* fix: stablecoins avg fee methodology and USDCx data source