Remove unused fiat module

[grunch]

Summary by CodeRabbit

• Refactor
  • Removed fiat currency handling functionality, including currency ticker validation and fiat value loading systems.

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: Organization UI

Review profile: CHILL

Plan: Pro

Run ID: 4396d25e-dee3-4155-b588-5edda07ac879

📥 Commits

Reviewing files that changed from the base of the PR and between ce07604 and d35e5ff.

📒 Files selected for processing (1)

• src/fiat.rs

💤 Files with no reviewable changes (1)

• src/fiat.rs

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Walkthrough

The entire src/fiat.rs module has been removed, including exported type aliases (FiatNames, FiatList), a FiatNamesValue struct, and two public functions (check_currency_ticker() and load_fiat_values()) that provided fiat currency ticker validation and metadata loading capabilities.

Changes

Cohort / File(s)	Summary
Fiat Module Removal src/fiat.rs	Deleted entire module containing fiat currency type aliases, a FiatNamesValue struct, and functions for currency ticker validation and loading embedded JSON fiat metadata (1466 lines removed).

Estimated code review effort

🎯 2 (Simple) | ⏱️ ~12 minutes

Poem

🐰 A fiat farewell, the module's gone away,
No more tickers checked or JSON to display,
Currencies cached were lovely, it's true,
But sometimes clean slates lead to clearer views!
✨ Hop along, codebase, to brighter horizons anew!

🚥 Pre-merge checks | ✅ 3

✅ Passed checks (3 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title 'Remove unused fiat module' accurately and concisely summarizes the main change: deletion of the entire src/fiat.rs file and its exported functions and types.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.

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✨ Finishing Touches

📝 Generate docstrings

• Create stacked PR
• Commit on current branch

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch chore/remove-unused-fiat-module

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