feat(truapi): native bridge for funding and top-ups

[filvecchiato]

iOS and Android hosts drive funding through NativeTrUApiHostRuntime:

• set_funding_callbacks installs the overlay (present_funding, funding_session_changed).
• set_top_up_callbacks installs the top-up engine; the host answers a top-up's current status and pushes later ones with notify_top_up_status. A stream shows each status once, in order, and ends on the verdict; one subscriber reaching the verdict never ends another's stream.
• enable_funding_conversion, open_funding, quote_funding_deposit, assign_funding_deposit and funding_session run the on-ramp.

Canonical types cross directly with UniFFI derives (FundingPresentOutcome, HostPaymentTopUpError, the funding session types). Amounts cross as decimal strings, since Swift and Kotlin have no 128-bit integer. The iOS package compiles against the new bindings locally; Kotlin is left to the android-bindings job.

Part of #1142

[github-actions]

Bundle size report

Compared with main at 02c9712.

	Raw	Gzip	Brotli
truapi-host	7.85 MiB (+57.9 KiB, +0.7%)	5.65 MiB (+19.6 KiB, +0.3%)	5.38 MiB (+15.6 KiB, +0.3%)
truapi-provider	4.03 MiB	1.27 MiB	959.8 KiB
truapi	5.75 MiB (+35.3 KiB, +0.6%)	810.3 KiB (+5.4 KiB, +0.7%)	664.2 KiB (+4.2 KiB, +0.6%)
Total	17.63 MiB (+93.1 KiB, +0.5%)	7.71 MiB (+25.0 KiB, +0.3%)	6.97 MiB (+19.8 KiB, +0.3%)

WebAssembly modules

	Raw	Gzip	Brotli
truapi-host/wasm/web/truapi_server_bg.wasm	2.74 MiB (+57.4 KiB, +2.1%)	981.7 KiB (+19.5 KiB, +2.0%)	741.9 KiB (+15.4 KiB, +2.1%)
truapi-host/wasm/web/truapi_verifiable_bg.wasm	4.89 MiB	4.64 MiB	4.61 MiB
truapi-provider/truapi_provider_bg.wasm	3.99 MiB	1.26 MiB	952.1 KiB

Changed files (10)

	Raw	Gzip	Brotli
truapi-host/wasm/web/truapi_server_bg.wasm	2.74 MiB (+57.4 KiB, +2.1%)	981.7 KiB (+19.5 KiB, +2.0%)	741.9 KiB (+15.4 KiB, +2.1%)
truapi/explorer/codegen/types.js	217.6 KiB (+13.2 KiB, +6.5%)	29.8 KiB (+1.9 KiB, +6.9%)	24.0 KiB (+1.5 KiB, +6.8%)
truapi/playground/codegen/truapi-dts.js	285.0 KiB (+12.2 KiB, +4.5%)	49.1 KiB (+2.2 KiB, +4.6%)	39.6 KiB (+1.7 KiB, +4.5%)
truapi/playground/codegen/services.js	97.9 KiB (+3.2 KiB, +3.4%)	14.7 KiB (+430 B, +2.9%)	12.3 KiB (+327 B, +2.7%)
truapi/generated/types.js	62.8 KiB (+3.0 KiB, +5.0%)	7.7 KiB (+441 B, +6.0%)	6.5 KiB (+321 B, +5.1%)
truapi/generated/client.js	68.8 KiB (+2.3 KiB, +3.5%)	10.3 KiB (+337 B, +3.3%)	8.5 KiB (+276 B, +3.3%)
truapi/generated/wire-decode.js	28.2 KiB (+1.1 KiB, +3.9%)	3.0 KiB (+77 B, +2.6%)	2.5 KiB (+60 B, +2.4%)
truapi-host/generated/host-callbacks.js	10.5 KiB (+432 B, +4.2%)	3.4 KiB (+132 B, +4.0%)	2.8 KiB (+116 B, +4.1%)
truapi/generated/wire-table.js	8.8 KiB (+295 B, +3.4%)	1.5 KiB (+26 B, +1.7%)	1.2 KiB (+19 B, +1.5%)
truapi-host/wasm/web/truapi_server.js	57.8 KiB (+3 B)	10.5 KiB (+1 B)	9.1 KiB (+9 B, +0.1%)

_{Commit: 7881670}

[github-actions]

CI Status: not green, 1 item needs attention.

• ios-swift: failure

All job results

job	result
android-bindings	success
bundle-size	success
changes	success
changeset-guard	success
cli-package	success
codegen	success
e2e	skipped
explorer	success
headless-install	success
host-android-bindings	success
host-android-detekt	success
host-wasm	success
ios-bindings	success
ios-swift	failure
licenses	success
playground	success
provider-android-bindings	skipped
release-guard	success
rust	success
ts-client	success
ts-debugger	success
ts-host	success
wasm-provider	success
workflow-lint	skipped

Signing credentials: failure as of 2026-10-06, a release may fail

_{Commit 78816703 · run log}

[filvecchiato]

Consolidated into #1230, which carries these commits.