feat: split large code into testable units

[justraman]

No description provided.

[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.

[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	886.0 KB	121.6 KB	162.8 KB
host/assets/smoldot_worker.js	2.92 MB	2.19 MB	2.20 MB
Total	10.44 MB (-11.9 KB)	5.39 MB (-7.3 KB) (-48%)	5.73 MB (-8.2 KB)

All files

File	Raw	Brotli	Gzip
host/.well-known/apple-app-site-association	738 B	738 B	738 B
host/.well-known/assetlinks.json	986 B	986 B	986 B
host/assets/auth.js	462.6 KB	175.6 KB (+2 B)	221.5 KB (+1 B)
host/assets/blake2.js	10.1 KB	3.2 KB (-3 B)	3.7 KB
host/assets/bridge.js	5.4 KB	1.8 KB (-1 B)	2.1 KB (-4 B)
host/assets/browser.js	22.9 KB	7.6 KB	8.6 KB
host/assets/client.js	93.0 KB	27.4 KB (-3 B)	30.1 KB
host/assets/container.js	54.1 KB	13.2 KB (-1 B)	15.0 KB (-10 B)
host/assets/dist.js	20.6 KB (-8.2 KB)	4.8 KB (-5.1 KB)	5.4 KB (-5.7 KB)
host/assets/dist.js	28.8 KB	9.9 KB	11.1 KB (-1 B)
host/assets/dist.js	24.9 KB (-3.9 KB)	7.7 KB (-2.2 KB)	8.6 KB (-2.5 KB)
host/assets/dotli-debug-bus.js	495 B	495 B	495 B
host/assets/index.js	106.6 KB (+182 B)	29.1 KB (+94 B)	34.0 KB (+34 B)
host/assets/index.css	47.8 KB	7.4 KB	8.3 KB
host/assets/log.js	972 B	972 B	972 B
host/assets/manifest.js	22.6 KB	7.3 KB (-6 B)	8.0 KB (+2 B)
host/assets/mode.js	1.7 KB	600 B	664 B
host/assets/nanoevents.js	215 B	215 B	215 B
host/assets/nova-scale.js	6.7 KB	2.6 KB	2.9 KB
host/assets/panel.js	84.9 KB	23.0 KB (-8 B)	26.3 KB (-1 B)
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	142.2 KB	23.0 KB	32.1 KB
host/assets/previewnet.smol.json	886.0 KB	121.6 KB	162.8 KB
host/assets/resolve.js	152 B	152 B	152 B
host/assets/rolldown-runtime.js	694 B	694 B	694 B
host/assets/rpc-resolve.js	2.5 KB	1.0 KB (-1 B)	1.2 KB (-2 B)
host/assets/shared-mode.js	1.9 KB	793 B	896 B (-1 B)
host/assets/smoldot_worker.js	2.92 MB	2.19 MB	2.20 MB
host/assets/spans.js	1.6 KB	765 B	914 B
host/assets/src.js	1.9 KB	888 B (-2 B)	998 B (-2 B)
host/assets/styles.css	15.1 KB	3.2 KB	3.8 KB
host/assets/substrate-client.js	7.2 KB	2.7 KB (+1 B)	3.0 KB (+1 B)
host/assets/ws.js	25.8 KB	8.4 KB (-8 B)	9.1 KB (-3 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	2.8 KB	1.1 KB (-24 B)	1.3 KB (+1 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	20.2 KB	4.5 KB (+1 B)	5.5 KB (+2 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	8.7 KB	2.8 KB (-3 B)	3.2 KB (-2 B)
sandbox/assets/bitswap-bridge.js	840 B	840 B	840 B
sandbox/assets/fetch.js	3.4 KB	1.2 KB	1.4 KB (+1 B)
sandbox/assets/index.js	118.0 KB	33.7 KB (-40 B)	39.6 KB (-1 B)
sandbox/assets/index.css	47.8 KB	7.4 KB	8.3 KB
sandbox/favicon.svg	1.8 KB	1.8 KB	1.8 KB
sandbox/index.html	1.7 KB	580 B (+1 B)	788 B (+3 B)
Total	10.44 MB (-11.9 KB)	5.39 MB (-7.3 KB) (-48%)	5.73 MB (-8.2 KB)

_{Commit: b412def}

[github-actions]

⚠️ E2E Product suite skipped — Nova signing bot is unavailable.

This is a Nova-side outage and not a dot.li test failure. Re-run
from the Actions tab once the bot recovers.

Logs: https://github.com/paritytech/dotli-community/actions/runs/28412254385