feat: experimental support for streaming SSE in live mode

[kevin-dp]

Rebases #2544 on latest main

[codecov]

Codecov Report

Attention: Patch coverage is 64.97175% with 62 lines in your changes missing coverage. Please review.

Project coverage is 77.64%. Comparing base (f4cb5c1) to head (dd84d2e).
Report is 1 commits behind head on main.

✅ All tests successful. No failed tests found.

Files with missing lines	Patch %	Lines
packages/sync-service/lib/electric/shapes/api.ex	49.18%	31 Missing ⚠️
packages/typescript-client/src/client.ts	71.76%	24 Missing ⚠️
packages/typescript-client/src/helpers.ts	0.00%	4 Missing ⚠️
...es/sync-service/lib/electric/shapes/api/encoder.ex	75.00%	1 Missing ⚠️
...ages/sync-service/lib/electric/shapes/api/error.ex	75.00%	1 Missing ⚠️
packages/typescript-client/src/fetch.ts	83.33%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2856      +/-   ##
==========================================
- Coverage   78.04%   77.64%   -0.40%     
==========================================
  Files         156      156              
  Lines        7337     7462     +125     
  Branches      275      287      +12     
==========================================
+ Hits         5726     5794      +68     
- Misses       1609     1666      +57     
  Partials        2        2              

Flag	Coverage Δ
elixir	76.68% <59.25%> (-0.23%)	⬇️
elixir-client	73.03% <ø> (ø)
packages/experimental	87.73% <ø> (ø)
packages/react-hooks	86.30% <ø> (ø)
packages/typescript-client	89.37% <69.79%> (-3.20%)	⬇️
packages/y-electric	55.12% <ø> (ø)
postgres-140000	76.70% <59.25%> (-0.33%)	⬇️
postgres-150000	76.86% <59.25%> (-0.22%)	⬇️
postgres-170000	76.83% <59.25%> (-0.30%)	⬇️
sync-service	77.17% <59.25%> (-0.26%)	⬇️
typescript	82.87% <69.79%> (-1.59%)	⬇️
unit-tests	77.64% <64.97%> (-0.40%)	⬇️

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[alco]

Nice 👍

I have refactored the Elixir code to piggy-back off the opts argument in the get_merged_log_stream() function instead of adding another argument to it.

Also, passing options instead of just a boolean value to must_refetch() makes the code a tinsy bit more readable.

[alco]

This test keeps failing no matter how many times I rerun it. Doesn't look like flake.

HTTP Proxy Cache > should get fresh response when age is passed the stale age 5015ms
     → Test timed out in 5000ms.

[kevin-dp]

This test keeps failing no matter how many times I rerun it. Doesn't look like flake.

HTTP Proxy Cache > should get fresh response when age is passed the stale age 5015ms
     → Test timed out in 5000ms.

Yes, this test started failing when i upgraded Vitest to v3. If i downgrade it back to v2 it passes again..

[kevin-dp]

@alco i fixed the failing unit test. It seems that Vitest v3 ignores the "timeout" configuration on the describe block. So i removed it and added a custom timeout for the caching test. It's green now.