feat(txtop): Track Materios L2 transactions

[arepala-uml]

1. Using this transaction metadata (https://cexplorer.io/tx/b2b55a984af345b3ae758d7c92ee033e3066b24c17b7b1755f07a30e9bababf3?tab=metadata), I have made changes to detect materios transactions by Cardano metadata label 8746.
2. For any of the pending transactions from mempool if it is detected as materios then i am showing it with icon 'M' and added the icon to the legend as well.
3. Added a unit test for materios metadata detection using the above transaction metadata as sample.
4. I have fixed the tcp retry behavior by creating a fresh ouroboros connection per retry attempt. (This is not related to this issue but i ran into some connection errors when trying to connect cardano node).

Closes #315

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Summary by cubic

Detect Materios L2 transactions using Cardano metadata label 8746 and mark them with an Ⓜ️ icon in the mempool and legend. Also fixes retry stability by creating a new ouroboros connection on each attempt.

• New Features

  • Detect Materios tx via label 8746 with marker k: "p", v: "materios".
  • Show Ⓜ️ for matching pending tx; add "Materios" to the legend.
  • Add unit tests for the detection logic.

• Bug Fixes

  • Create a fresh ouroboros connection per retry to avoid closed error channels and half-open reconnects.

^{Written for commit d380a2e. Summary will update on new commits.}

Summary by CodeRabbit

Release Notes

• New Features

  • Implemented detection of Materios transactions with dedicated Ⓜ️ icon display
  • Updated UI legend to include Materios transaction type

• Bug Fixes

  • Improved connection retry handling to explicitly close failed socket connections before subsequent retry attempts

[coderabbitai]

📝 Walkthrough

Walkthrough

This PR refactors the connection retry mechanism in GetConnection to create fresh connection objects and error channels per retry attempt, with explicit cleanup on dial failure. It adds recursive metadata detection to identify Materios L2 transactions via marker inspection (key/value pairs and integer marker 8746) within nested structures, applies the Materios icon (Ⓜ️) during transaction processing when metadata matches, updates the UI legend to display Materios, and includes unit tests validating the detection logic against in-memory fixtures.

🚥 Pre-merge checks | ✅ 4

✅ Passed checks (4 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title accurately reflects the main feature being implemented—tracking Materios L2 transactions with metadata detection and UI visibility.
Linked Issues check	✅ Passed	The PR fulfills issue #315 requirements by detecting Materios transactions via metadata label 8746 and displaying them with an icon in the UI.
Out of Scope Changes check	✅ Passed	The TCP retry connection fix is a related bug fix improving reliability when connecting to a Cardano node, not unrelated to the primary objective.
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.

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✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch feat/315/track_materios_l2_txs

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[cubic-dev-ai]

No issues found across 2 files

_{Re-trigger cubic}