fix(ui): show correct duration for fee rate

[pwltr]

Description

Mostly a refactor/cleanup but also adds a way to override fee estimates in debug mode (useful for UI work) and aims to show estimated confirmation time when a custom fee is set, instead of "Depends on fee".

• show correct duration for fee rate where applicable (transaction speed settings, send fee rate, boost sheet)
• Route fee estimation usage through FeeEstimatesManager; remove direct blocktank.fees() calls
• Activity: design updates v59 (activity icons, text)
• force .modern, .bitcoin denomination for custom fee UI
• add "override fees" dev setting to be able to debug fee estimation UI
• update localization keys and strings
• ActivityListViewModel/TransferViewModel: drop unnecesary fee estimation refresh (payOrder takes required satsPerVbyte, estimates cache warmed in ActivityList/ActivityLatest .task)

Screenshot / Video

Simulator.Screen.Recording.-.iPhone.17.-.2026-03-05.at.17.29.39.mov

[pwltr]

Drafted to give precedence to other PRs

[claude]

Missing translations: fee__*__range, wallet__activity_transferring, and wallet__activity_in_transfer are absent from all non-English locales

These new localization keys were added to en.lproj in this PR but are missing from all 14 other locale files (ca, cs, de, el, es, es-419, fr, it, nl, pl, pt-BR, ru, and others):

• fee__fast__range, fee__normal__range, fee__slow__range, fee__minimum__range, fee__custom__range — used at runtime in FeeItem.swift (via speed.range), SendFeeRate.swift (via customFeeRangeOverride), and SendConfirmationView.swift
• wallet__activity_transferring — used in ActivityRowOnchain.swift for the status label of unconfirmed transfers
• wallet__activity_in_transfer — used in ActivityItemView.swift for the detail view status

The non-English locale files did receive fee__*__longRange and fee__*__longTitle translations, but not the shorter fee__*__range variants. For users on any non-English locale, t("fee__fast__range") etc. will return the raw key string instead of a translated duration.

See:

bitkit-ios/Bitkit/Resources/Localization/en.lproj/Localizable.strings

Lines 90 to 95 in 45f8dd0

	"fee__fast__longTitle" = "Fast (more expensive)";
	"fee__fast__description" = "±10 minutes";
	"fee__fast__shortDescription" = "±10m";
	"fee__fast__range" = "±10-20 minutes";
	"fee__fast__longRange" = "± 10-20 minutes";
	"fee__normal__title" = "Normal";

[claude]

Code review

Found 3 issues:

1. Compile error — type mismatch in SendFeeRate.swift (link)

wallet.totalBalanceSats is Int but amount + fee is UInt64. Swift will not compile this comparison. The fix is to restore the explicit cast that was removed along with onchainBalance: UInt64(wallet.totalBalanceSats) < amount + fee.

2. wallet__activity_boosting missing from all locale files (link)

This key is used in ActivityRowOnchain.swift and ActivityItemView.swift but was never added to any .strings file — including en.lproj. Every user will see the raw key string "wallet__activity_boosting" at runtime.

3. Several new keys missing from non-English locale files (link)

The following keys were added to en.lproj but not to any of the 14 other locales: fee__fast__range, fee__normal__range, fee__slow__range, fee__minimum__range, fee__custom__range, wallet__activity_transferring, and wallet__activity_in_transfer. Non-English users will see raw key strings in the fee rate UI and activity list.

[ovitrif]

Non-English users will see raw key strings in the fee rate UI and activity list.

Is this how it works?! 🤦🏻 In Android it simply shows the non-translated text using the default locale, ie. English copy.
This is platform-level thing, just curious.

[pwltr]

Non-English users will see raw key strings in the fee rate UI and activity list.

No it's making shit up, it falls back to English.