Render snapshot bootstrap progress

[findolor]

Summary

Renders snapshot bootstrap progress immediately and connects the validated snapshot runtime to the existing Raindex providers.

This is PR 3 of 3. Generic preinstalled-database support is in #2872; the application-specific bootstrap service is in #2873.

User experience

• Renders the normal shell during cold bootstrap instead of a blank page.
• Shows the existing local-database status UI with the active phase and elapsed duration.
• Exposes orders/vaults as soon as the installed snapshot validates while live RPC catch-up continues.
• Reports installed/reused duration and actual database size.
• Surfaces failures through the existing error page.
• Keeps the root document fixed while the main content region scrolls.
• Announces meaningful phase/completion/failure changes without announcing every timer tick.

Lifecycle and navigation

• The explicit loading override is provider-free and cannot dereference a client before providers exist.
• Provider subtrees remount when the authoritative runtime changes, so Svelte contexts cannot retain an old database/client.
• Client-side entry into snapshot mode starts bootstrap correctly.
• Snapshot failures remain authoritative across navigation and never mount null providers.
• Client initialization is generation- and identity-guarded; a replaced client's delayed sync snapshot cannot overwrite the new runtime's stores.
• Owned and late-resolving runtimes are freed exactly once. Teardown starts asynchronous runtime disposal without creating unhandled rejections; Add opt-in web snapshot bootstrap #2873 retains the Web Lock until SQLite shutdown completes.
• Unknown rejection values produce useful stable messages.

Review-loop fixes

Codex review fixed the real-provider cold-start crash, stale Svelte contexts, client-navigation opt-in gap, failure-state loss, structured-error formatting, teardown gaps, stale async client-state race, and async SQLite close integration.

Verification

• focused layout suite: 20/20 passed
• full webapp suite: 274 passed, 9 skipped; only the pre-existing external registry HTTP integration failed
• webapp ESLint passed
• Svelte check passed with 0 errors/warnings
• production webapp build passed
• git diff --check passed
• final independent Codex re-review was clean

Stack

1. Support preinstalled local database snapshots #2872 — generic preinstalled local-database support
2. Add opt-in web snapshot bootstrap #2873 — application-specific snapshot bootstrap service
3. This PR: rendering and provider wiring

SQLite transport dependency: rainlanguage/sqlite-web#32 (stacked on #33 and #34).

Remote publisher follow-up

The current remote flow does not publish the single browser-ready SQLite artifact used by this POC. Moving beyond the POC requires building/checkpointing the combined database, uploading an immutable compressed object, then publishing an application manifest last with digest, exact uncompressed size, schema version, generation time, and per-target watermarks.

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[findolor]

Warning

This pull request is not mergeable via GitHub because a downstack PR is open. Once all requirements are satisfied, merge this PR as a stack on Graphite.
Learn more

• Render snapshot bootstrap progress #2871 👈 (View in Graphite)
• Add opt-in web snapshot bootstrap #2873
• Support preinstalled local database snapshots #2872
• main

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[findolor]

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