zero-swift: client and storage fixes from the bug sweep (#13)

* test(zero-swift): sweep tests for swift-client-fixes

Amp-Thread-ID: https://ampcode.com/threads/T-c513a037-a257-45e0-b9a9-15c15edfe859
Co-authored-by: tmm <tmm@tmm.dev>

* fix(zero-swift): a poke that changes nothing marks got queries authoritative

As in zero.ts, the poke callback marks the got queries authoritative after rep.poke, even when the poke is a no-op, if the socket it came on is still the current one. An empty first poke after a reconnect or relaunch left views and preloads incomplete.

Amp-Thread-ID: https://ampcode.com/threads/T-c513a037-a257-45e0-b9a9-15c15edfe859
Co-authored-by: tmm <tmm@tmm.dev>

* fix(zero-swift): <= and >= filters never match NaN

JS compareValues returns a - b, which is NaN for a NaN operand, so <= and >= are false. compare keeps its total order for sorting.

Amp-Thread-ID: https://ampcode.com/threads/T-c513a037-a257-45e0-b9a9-15c15edfe859
Co-authored-by: tmm <tmm@tmm.dev>

* fix(zero-swift): storage failures reach every client and busy writes are retried

- Every client sharing a ReplicaDatabase hears about a write failure; a closed client is removed.
- SQLiteStore stops writing at the first failure, so writes queued before it don't land after it.
- SQLITE_BUSY/LOCKED is not a storage failure (classifySQLiteError): the ops are kept and written with the next write.
- A read failure loading the client group in initClient is reported and moves the client to memory, as for a failed open.
- The memory fallback after a failed open is shared by name, like .memory (fallbackStoreProvider, MemStore).
- Drop the two SweepStorageTests for active clients, fixed on another branch.

Amp-Thread-ID: https://ampcode.com/threads/T-c513a037-a257-45e0-b9a9-15c15edfe859
Co-authored-by: tmm <tmm@tmm.dev>

* test(zero-swift): await a task instead of a semaphore in the busy test

macOS rejects DispatchSemaphore.wait() in an async context.

Amp-Thread-ID: https://ampcode.com/threads/T-c513a037-a257-45e0-b9a9-15c15edfe859
Co-authored-by: tmm <tmm@tmm.dev>

---------

Co-authored-by: Amp <amp@ampcode.com>

Author: tmm

.changeset/client-fixes.md

@@ -0,0 +1,5 @@
+---
+'zero-swift': patch
+---
+
+A first poke that changes nothing after a reconnect or relaunch completes the got queries, as in JS. `<=` and `>=` filters no longer match `NaN`. Storage: every client sharing a database hears about a write failure, and a closed client doesn't; writes queued before a failure no longer land after it; a database busy past the busy timeout is retried by the next write instead of being a storage failure; a read failure loading the client group is reported through `onStorageFailure` and moves the client to memory; and the memory fallback after a failed open is shared by name in the process, like `.memory`.