Announce a pump fault and release the handles waiting on it

[LucaCappelletti94]

When the client's background driver hit an error that was not a lost connection, it stopped without telling anyone. No event went out, the socket stayed open, and everything waiting on the client kept waiting for good, a live query's changed(), a content ticket, the file client's heal loop. An application had no way to show that sync had died.

Such an error now ends the driver the way a close does, except that the application first receives ClientEvent::Stopped carrying the error's text, then the usual Closed, so everything that already settles on Closed settles. Live handles return ClientError::Stopped from changed(), while their rows and with_conn keep working on the local copy, as after close(). The three demos show the message in their status line.

The new test in crates/connetto-client/tests/it/pump_fault.rs feeds the client a live patch that cannot be decoded. On main it waits out its five-second bound with no event at all, and here it sees Stopped then Closed, the waiting handle released and the socket closed.

[coderabbitai]

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[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud

[codecov]

Codecov Report

❌ Patch coverage is 49.05660% with 27 lines in your changes missing coverage. Please review.
✅ Project coverage is 85.59%. Comparing base (ded95a2) to head (d2a2961).

Files with missing lines	Patch %	Lines
crates/connetto-client/src/live.rs	49.05%	25 Missing and 2 partials ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #129      +/-   ##
==========================================
+ Coverage   85.58%   85.59%   +0.01%     
==========================================
  Files         147      147              
  Lines       35323    35361      +38     
  Branches    35323    35361      +38     
==========================================
+ Hits        30230    30267      +37     
- Misses       3410     3414       +4     
+ Partials     1683     1680       -3     

Flag	Coverage Δ
client	55.18% <49.05%> (+0.02%)	⬆️
rest	53.22% <3.77%> (-0.32%)	⬇️
server	53.26% <0.00%> (-0.09%)	⬇️

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