fix(ui): keep preimage lookup polling

[pgherveou]

Summary

Keep the host-side preimage lookup stream alive after transient IPFS gateway or bitswap failures.

The Rust core treats lookup as a subscription and performs hash-integrity verification. Ending that stream on a single backend error prevents later replication from ever becoming visible. This layer logs transient backend failures and lets the existing polling interval try again.

It also makes the bitswap startup warning accurate in RPC gateway mode.

Base

Stacked on #70. This behavior fix is intentionally outside the architecture migration diff.

Verification

• bun run test tests/preimage.test.ts
• bunx eslint src/bulletin-bitswap.ts src/host-callbacks/Preimage.ts

[github-actions]

Bundle Size Report

Chunks over 500 KB:

File	Raw	Brotli	Gzip
host/assets/paseo.smol-DboPaEh1.json	1.84 MB	941.7 KB	1019.4 KB
host/assets/paseo-people-next.smol.json	3.36 MB	1.68 MB	1.82 MB
host/assets/previewnet.smol.json	1.78 MB	137.2 KB	333.5 KB
host/assets/smoldot.js	2.95 MB	2.20 MB	2.21 MB
host/assets/smoldot_worker.js	2.92 MB	2.19 MB	2.20 MB
host/assets/wasm/web/truapi_server_bg.wasm	1.98 MB	619.4 KB	815.5 KB
Total	15.74 MB (+5.09 MB)	8.03 MB (+2.86 MB) (-49%)	8.68 MB (+3.07 MB)

All files

File	Raw	Brotli	Gzip
host/.well-known/apple-app-site-association	738 B	738 B	738 B
host/.well-known/assetlinks.json	1.3 KB	317 B	391 B
host/assets/bridge.js	51.5 KB (+46.2 KB)	14.3 KB (+12.5 KB)	16.1 KB (+14.0 KB)
host/assets/browser.js	22.9 KB (-10 B)	7.5 KB (-19 B)	8.6 KB (-9 B)
host/assets/client.js	100.1 KB (+7.1 KB)	29.4 KB (+2.1 KB)	32.4 KB (+2.3 KB)
host/assets/dist.js	30.3 KB (+5.5 KB)	10.5 KB (+2.8 KB)	11.7 KB (+3.1 KB)
host/assets/dotli-debug-bus.js	710 B (+215 B)	710 B (+215 B)	710 B (+215 B)
host/assets/get-sync-provider.js	2.8 KB	1.1 KB	1.2 KB
host/assets/hex.js	154 B	154 B	154 B
host/assets/index.css	44.8 KB (-3.1 KB)	7.1 KB (-382 B)	7.9 KB (-423 B)
host/assets/index.js	150.5 KB (+43.9 KB)	41.5 KB (+12.4 KB)	48.8 KB (+14.8 KB)
host/assets/manifest.js	22.5 KB (-130 B)	7.2 KB (-97 B)	7.9 KB (-65 B)
host/assets/panel.js	72.6 KB (-12.2 KB)	19.7 KB (-3.3 KB)	22.3 KB (-4.0 KB)
host/assets/paseo.smol-DboPaEh1.json	1.84 MB	941.7 KB	1019.4 KB
host/assets/paseo-people-next.smol.json	3.36 MB	1.68 MB	1.82 MB
host/assets/paseo.smol.json	19.7 KB	4.8 KB	5.4 KB
host/assets/previewnet.smol.json	1.78 MB	137.2 KB	333.5 KB
host/assets/resolve.js	128 B (-24 B)	128 B (-24 B)	128 B (-24 B)
host/assets/rpc-resolve.js	2.4 KB (-71 B)	1.0 KB (-14 B)	1.1 KB (-34 B)
host/assets/shared-mode.js	1.8 KB (-82 B)	751 B (-42 B)	853 B (-44 B)
host/assets/smoldot.js	2.95 MB	2.20 MB	2.21 MB
host/assets/smoldot_worker.js	2.92 MB	2.19 MB	2.20 MB
host/assets/src.js	1.8 KB (-119 B)	859 B (-31 B)	946 B (-53 B)
host/assets/styles.css	15.1 KB	3.2 KB	3.8 KB
host/assets/wasm/web/README.md	10.9 KB	10.9 KB	10.9 KB
host/assets/wasm/web/package.json	371 B	371 B	371 B
host/assets/wasm/web/truapi_server.d.ts	6.9 KB	6.9 KB	6.9 KB
host/assets/wasm/web/truapi_server.js	35.6 KB	6.2 KB	7.2 KB
host/assets/wasm/web/truapi_server_bg.wasm	1.98 MB	619.4 KB	815.5 KB
host/assets/wasm/web/truapi_server_bg.wasm.d.ts	2.5 KB	2.5 KB	2.5 KB
host/assets/web.js	13.2 KB	3.5 KB	4.0 KB
host/assets/worker-runtime.js	6.3 KB	1.6 KB	1.8 KB
host/assets/worker-runtime.js	106 B	106 B	106 B
host/assets/ws.js	23.1 KB (-2.8 KB)	7.5 KB (-857 B)	8.2 KB (-921 B)
host/dotli.png	11.5 KB	11.5 KB	11.5 KB
host/favicon.svg	1.8 KB	1.8 KB	1.8 KB
host/host-sw.js	2.7 KB (-110 B)	1.1 KB (-14 B)	1.3 KB (-9 B)
host/icon-192.png	12.5 KB	12.5 KB	12.5 KB
host/icon-512.png	42.8 KB	42.8 KB	42.8 KB
host/index.html	19.9 KB (-320 B)	4.4 KB (-63 B)	5.4 KB (-70 B)
host/manifest.webmanifest	441 B	441 B	441 B
host/workbox.js	14.8 KB	4.6 KB	5.1 KB
sandbox/app-sw.js	9.6 KB	3.1 KB (+2 B)	3.5 KB (+5 B)
sandbox/assets/bitswap-bridge.js	840 B	840 B	840 B
sandbox/assets/fetch.js	3.4 KB	1.2 KB (-1 B)	1.4 KB (-2 B)
sandbox/assets/index.css	44.8 KB (-3.1 KB)	7.1 KB (-382 B)	7.9 KB (-423 B)
sandbox/assets/index.js	118.0 KB	33.7 KB (-40 B)	39.6 KB (+2 B)
sandbox/favicon.svg	1.8 KB	1.8 KB	1.8 KB
sandbox/index.html	1.7 KB	578 B (-4 B)	783 B (-4 B)
Total	15.74 MB (+5.09 MB)	8.03 MB (+2.86 MB) (-49%)	8.68 MB (+3.07 MB)

_{Commit: c67ede0}

[github-actions]

⚡ Performance Report

⚠️ No baseline found on main. This PR's results are recorded but cannot be compared.
Merge to main to establish a baseline.

[pgherveou]

Consolidated into #77 together with the hardening extracted from #70; this change is preserved there as its own commit.