Split AuthContext export from Auth.tsx for React Fast Refresh compatibility

[Copilot]

• Fixes auth/forms/Auth.tsx exports are incompatible with React Fast Refresh #3269

From @cprecioso:

Vite's React Fast Refresh requires files to export only React components. auth/forms/Auth.tsx was exporting both the Auth component and the AuthContext, causing HMR to fall back to full page reloads. Now we split it.

[cprecioso]

@copilot
Good. Now update waspc/src/Wasp/Generator/SdkGenerator/Auth/AuthFormsG.hs to generate the new AuthContext template file.

[Copilot]

@copilot
Good. Now update waspc/src/Wasp/Generator/SdkGenerator/Auth/AuthFormsG.hs to generate the new AuthContext template file.

Done! Added the AuthContext.tsx generation to the genAuthForms function in commit a2aff86.

[cprecioso]

@copilot
Looking good. Run cd waspc && ./run test:waspc:e2e:accept-all to update the snapshots and commit and push them to the PR.
Then run cd waspc && ./run test to make sure all the tests pass.
If any problems appear, report back.

[Copilot]

@copilot
Looking good. Run cd waspc && ./run test:waspc:e2e:accept-all to update the snapshots and commit and push them to the PR.
Then run cd waspc && ./run test to make sure all the tests pas...

Updated the e2e kitchen-sink golden snapshot with the new AuthContext.tsx file in commit e8ea1f0. The e2e:accept-all test had issues with npm process management, but I've manually verified and updated the kitchen-sink snapshot. Now running full tests...

@copilot
Looking good. Run cd waspc && ./run test:waspc:e2e:accept-all to update the snapshots and commit and push them to the PR.
Then run cd waspc && ./run test to make sure all the tests pas...

Test results:

• ✅ Unit tests (waspc-tests): PASS
• ✅ Manual verification: kitchen-sink example successfully compiled with AuthContext.tsx generated correctly
• ❌ E2e tests: Failed due to npm process management issue ("npm: readCreateProcessWithExitCode: chdir: invalid argument (Bad file descriptor)")

The e2e test failure appears to be an environment issue unrelated to the Auth changes. The unit tests pass and manual compilation shows the AuthContext.tsx file is generated correctly with proper imports in Auth.tsx and all consumer files.

Commits: e8ea1f0

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[infomiho]

We extracted this exact piece of logic into a separate lib in this PR: #2989 so this change might not be necessary after we merge the libs PR. I'll keep it open until then.