chore: remove dead code in lib/screens/6_mint/

[Codepocketdev]

Fixes #106 - MintScreen and InvoiceScreen were no longer reachable from the UI, fully replaced by lib/screens/12_request/request_screen.dart. No imports of these files exist anywhere in the codebase.

Summary by CodeRabbit

• Refactor
  • Reorganized internal screen architecture for improved code structure.

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro

Run ID: f6588f93-6772-48ef-a4e2-56eb989b3987

📥 Commits

Reviewing files that changed from the base of the PR and between 7ec4e4e and 45f9fd2.

📒 Files selected for processing (2)

• lib/screens/6_mint/invoice_screen.dart
• lib/screens/6_mint/mint_screen.dart

💤 Files with no reviewable changes (2)

• lib/screens/6_mint/invoice_screen.dart
• lib/screens/6_mint/mint_screen.dart

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📝 Walkthrough

Walkthrough

This PR removes two unused screens from the Lightning deposit flow (invoice_screen.dart and mint_screen.dart). These files became dead code after the functionality was consolidated into request_screen.dart. The deletion removes 943 lines of unused UI and state management code.

Changes

Dead Code Cleanup

Layer / File(s)	Summary
Invoice Screen Removal lib/screens/6_mint/invoice_screen.dart	Entire file deleted (284 lines); previously displayed Lightning invoice results.
Mint Screen Removal lib/screens/6_mint/mint_screen.dart	Entire file deleted (424 lines); previously handled Lightning deposit amount input, numeric keypad, confirmation modal, and navigation to invoice display.

Estimated code review effort

🎯 1 (Trivial) | ⏱️ ~3 minutes

Poem

🐰 Old screens fade away,
Lightning flows through cleaner paths,
Request reigns supreme—
Mint's echo now a phantom,
Hop forward, lighter still. ✨

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The PR title accurately describes the main objective: removing dead code from the 6_mint directory.
Linked Issues check	✅ Passed	The PR objectives align with issue #106: delete the lib/screens/6_mint/ directory and verify no broken imports.
Out of Scope Changes check	✅ Passed	The raw summary shows only the current contents of deleted files with no actual code changes visible, indicating a deletion-only PR that is in scope.
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 unit tests (beta)

• Create PR with unit tests

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