fix(ios): harden pasteIOSText against simctl pbcopy flake

[piotr-iohk]

Summary

• Harden pasteIOSText for iOS CI flake where mobile: setPasteboard fails with xcrun simctl pbcopy … exitcode 60.
• Retry setPasteboard (up to 4 attempts with backoff), then fall back to typeText if pasteboard or the Paste menu is unavailable.
• In restoreRnWallet, wait explicitly for RestoreButton (same pattern as native restoreWallet) so empty/failed paste fails clearly instead of a blind tap.

Does not relax balance assertions (migration_3 100k-short / zero-balance mismatches stay as product/env signals).

Evidence

bitkit-ios E2E Migration (iOS) run 34431873300 (master, attempt 3), job e2e-tests - v1.1.6 - migration_1-restore:

1. E2E attempt 1: Appium session create timeout (infra)
2. E2E attempt 2: pasteIOSText → WebDriverError: Process ended with exitcode 60 (cmd: 'xcrun simctl pbcopy …') on mobile: setPasteboard
3. E2E attempt 3: element ("~RestoreButton") still not displayed after 60000ms (consistent with failed/empty paste)

Related historical balance mismatches (not addressed here — product/env):

• migration_3 same run: Expected 446184 got 0, then got 346184 (exactly 100k short)
• Sep 8 migration_1: Expected 446712 got 346712 (100k short)
• Sep 6 migration_1: Appium timeout then Expected 446712 got 100000

Test plan

• CI / local iOS restore path exercises pasteIOSText (migration_1 restore or any mnemonic paste)
• Confirm pbcopy exit-60 no longer hard-fails the suite when retry/fallback succeeds
• Confirm migration_3 balance assertions still fail loudly if balance is wrong (no gutting)

[piotr-iohk]

Validation dispatch: bitkit-ios E2E Migration (iOS) with e2e_branch=ada/harden-pasteIOSText-pbcopy-retry → https://github.com/synonymdev/bitkit-ios/actions/runs/34529781285 (duplicate dispatch cancelled).

[piotr-iohk]

Re-dispatched after concurrency cancel of earlier attempts: https://github.com/synonymdev/bitkit-ios/actions/runs/34530116332 (e2e_branch=ada/harden-pasteIOSText-pbcopy-retry).

[piotr-iohk]

Validation note: first iOS Migration dispatch with only this branch (34530116332) never reached e2e-tests — prepare-wallets migration_2 died 3× on RN ActivityShort-1 (same harness flake as Android mig1), which skipped the whole e2e matrix via needs.

#219 was rebased onto this PR. Combined iOS Migration validation (paste + RN setup/tag waits): https://github.com/synonymdev/bitkit-ios/actions/runs/34531814945 (e2e_branch=ada/harden-migration1-rn-setup-and-tag-backup).

[piotr-iohk]

Validation: iOS E2E Migration FULL GREEN with combined branch (includes this paste fix): https://github.com/synonymdev/bitkit-ios/actions/runs/34531814945 — mig1–4 all success. mig1 attempt1 Appium session timeout (infra); attempt2 tag sync retries; attempt3 verified. No pbcopy exit-60 in the successful path.