fix(semantic-layers): show a friendly warning when schema enrichment falls back

[rusackas]

SUMMARY

When configuration-schema enrichment fails (connection refused, driver hiccups, etc.), the raw exception text was passed through to the UI as a danger toast. That reads as raw internals, varies wildly by driver, and isn't translatable. This swaps it for a stable, translatable message pointing at the server logs, where the full exception is already recorded via logger.exception.

BEFORE/AFTER SCREENSHOTS OR ANIMATED GIF

Before: toast shows e.g. connection failed (whatever the driver raised).
After: toast shows "Could not load metadata for this configuration; showing the default form. See the server logs for details."

TESTING INSTRUCTIONS

pytest tests/unit_tests/semantic_layers/api_test.py

Or point a semantic layer config at an unreachable host in the modal and confirm the toast shows the new message while the fallback form still renders.

ADDITIONAL INFORMATION

• Has associated issue:
• Required feature flags:
• Changes UI
• Includes DB Migration (follow approval process in SIP-59)
  • Migration is atomic, supports rollback & is backwards-compatible
  • Confirm DB migration upgrade and downgrade tested
  • Runtime estimates and downtime expectations provided
• Introduces new feature or API
• Removes existing feature or API

🤖 Generated with Claude Code

[bito-code-review]

Code Review Agent Run #be2ba4

Actionable Suggestions - 0

Review Details

• Files reviewed - 2 · Commit Range: 1a16b2a..1a16b2a

  • superset/semantic_layers/api.py
  • tests/unit_tests/semantic_layers/api_test.py
• Files skipped - 0
• Tools

  • MyPy (Static Code Analysis) - ✔︎ Successful
  • Astral Ruff (Static Code Analysis) - ✔︎ Successful
  • Whispers (Secret Scanner) - ✔︎ Successful
  • Detect-secrets (Secret Scanner) - ✔︎ Successful

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 65.27%. Comparing base (5ffdac1) to head (1a16b2a).
⚠️ Report is 3 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master   #42400   +/-   ##
=======================================
  Coverage   65.27%   65.27%           
=======================================
  Files        2795     2795           
  Lines      157549   157549           
  Branches    36039    36039           
=======================================
  Hits       102836   102836           
  Misses      52736    52736           
  Partials     1977     1977           

Flag	Coverage Δ
hive	38.43% <0.00%> (ø)
mysql	57.63% <0.00%> (ø)
postgres	57.67% <0.00%> (ø)
presto	40.35% <0.00%> (ø)
python	59.08% <100.00%> (ø)
sqlite	57.30% <0.00%> (ø)
unit	100.00% <100.00%> (ø)

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