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174c38e4bd fix(desktop): recover full local storage on startup (#3182 )

## Summary
- recover already-full Buzz installs before desktop initialization
without deleting healthy caches
- enforce a global 2 MiB UTF-16 byte budget across disposable message,
channel, timeline-skeleton, and sidebar-skeleton caches, regardless of
relay count
- route all disposable cache writes through quota recovery and reserve
roughly 3 MiB of WebKit's observed ~5 MiB quota for durable state
- preserve communities, identities, preferences, drafts, and read state;
match only delimiter-qualified disposable namespaces

## Context
WebKit enforces an approximately 5 MiB per-origin localStorage quota and
Tauri does not expose an app-level knob to raise it to 50 MiB. Buzz
0.4.26 shipped reactive recovery for selected durable writes, but
disposable writers swallowed quota failures and their existing limits
were count-based per relay rather than byte-based per origin.

This PR handles both halves: upgrade recovery for already-wedged origins
and proactive global headroom so disposable snapshots cannot drive the
origin back to the cliff.

## Safety
- startup first probes a one-byte marker; healthy installs retain their
caches
- only if the marker write fails are the four relay-rehydratable cache
namespaces removed
- namespace matching requires the `v1:` delimiter, preventing future
`v10` or similarly named durable keys from matching
- oversized individual snapshots are rejected; crossing the global
budget evicts disposable snapshots only
- failed recovery leaves the marker absent, so the next launch retries

## Verification
- `pnpm test` — 3,670 passed
- `pnpm check`
- `pnpm typecheck`
- push hooks: branch-skew, desktop-check, desktop-test passed
- byte-budget tests cover UTF-16 accounting, multiple relays, oversized
writes, durable-state preservation, healthy startup, full startup,
marker retry, and namespace near misses

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Signed-off-by: Wes <wesbillman@users.noreply.github.com>
Co-authored-by: Carl <c7ebe626f000404285d3686e1dc74cc07cc60a9754a150041ba132e14bd3e2ec@buzz.block.builderlab.xyz>

2026-07-27 12:49:07 -07:00