feat: add Rosen Bridge FIRO ↔ rsFIRO swaps

[reubenyap]

Adds Rosen Bridge to the existing Swap flow for native FIRO ↔ rsFIRO on Ethereum mainnet. Users can create, fund, refresh, and resume swaps through the existing mobile/desktop confirmation screens and trade history.

Includes the rsFIRO and Campfire commits from #1444. Campfire can add FIRO, ETH, rsFIRO, USDC, and USDT wallets. The bridge and Add wallet share one rsFIRO contract definition.

Implementation

• Reuses Exchange, trade persistence, wallet signing/broadcast, FIRO coin selection, and ERC-20 transaction history. Uses existing coinlib address/hex helpers and web3dart ABI encoding.
• FIRO funding uses transparent funds with the required OP_RETURN; rsFIRO funding appends Rosen metadata to the ERC-20 transfer and pays gas in ETH. Signed transaction contents, mainnet, balances, fees, and nonce are checked before broadcast.
• Changed bridge fees require a refreshed quote and another confirmation. Concurrent funding and stale trade updates cannot erase a recorded deposit.
• Desktop wallet selection retains the selected wallet ID. Token registration preserves existing contract records.
• Runs the complete Flutter test suite with coverage enabled and existing prebuild stubs. Tests use package imports across the lib/ boundary to prevent duplicate library identities that trigger the Dart coverage collector crash. No test assertions, discovery rules, or coverage exclusions were changed; test execution is capped at 20 minutes and the job at 30 minutes.
• Updates the Codecov action to support tokenless public-fork uploads and report upload failures as CI failures.

Protocol configuration and pinned upstream references are documented in docs/rosen_bridge.md.

Validation

• Full Linux CI passed on the final commit: 361 tests passed with coverage enabled, with 5 existing native-library skips. Codecov verified its uploader signature and accepted the report from this fork PR. The complete coverage-enabled suite also passed on both preceding revisions of the CI fix.
• Passed 16 focused Flutter tests on macOS using the configured application dependencies: fee boundaries, protocol metadata, signed FIRO and ERC-20 transactions, Hive trade refresh/persistence, and Campfire token filtering.
• Targeted analysis found no compile errors; existing warnings/lints remain.
• Dart 3.12.2 formatting and git diff --check pass.

The full local macOS run with coverage completed without process crashes (361 passed, 4 skipped); its existing PIN test expects zero biometric calls on Linux and fails that assertion on macOS. No test assertions were changed for this CI fix.

This remains a draft until the application flows and live transfers in both directions are validated; no funds were sent during testing.

[codecov]

Codecov Report

❌ Patch coverage is 34.32116% with 953 lines in your changes missing coverage. Please review.
✅ Project coverage is 5.43%. Comparing base (d14ad05) to head (0718d2f).
⚠️ Report is 1 commits behind head on staging.

Files with missing lines	Patch %	Lines
lib/services/exchange/rosen/rosen_funding.dart	21.47%	128 Missing ⚠️
...desktop_exchange/exchange_steps/step_scaffold.dart	0.00%	112 Missing ⚠️
...exchange_view/exchange_step_views/step_3_view.dart	0.00%	83 Missing ⚠️
...b/pages/exchange_view/confirm_change_now_send.dart	0.00%	77 Missing ⚠️
lib/pages/exchange_view/send_from_view.dart	0.00%	65 Missing ⚠️
..._wallet_views/add_wallet_view/add_wallet_view.dart	0.00%	60 Missing ⚠️
...exchange_view/exchange_step_views/step_4_view.dart	0.00%	46 Missing ⚠️
..._views/add_token_view/edit_wallet_tokens_view.dart	0.00%	45 Missing ⚠️
.../exchange_view/choose_address_from_stack_view.dart	0.00%	41 Missing ⚠️
...ange/exchange_steps/subwidgets/desktop_step_4.dart	0.00%	41 Missing ⚠️
... and 18 more

Additional details and impacted files

@@             Coverage Diff             @@
##           staging    #1445      +/-   ##
===========================================
+ Coverage     4.80%    5.43%   +0.63%     
===========================================
  Files         1110     1117       +7     
  Lines       111087   112079     +992     
===========================================
+ Hits          5333     6091     +758     
- Misses      105754   105988     +234     

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[julian-CStack]

this needs to be redone as it was based on a bad base. See close reason for #1444