fix(webapp): show errors on AI tool call and embed spans in the run inspector

[matt-aitken]

Summary

When an AI SDK tool call failed inside a run, the span showed up under the "Errors only" filter but the span inspector gave no hint of what went wrong. The exception was recorded on the span all along; the ai.toolCall and ai.embed inspector views just never rendered span events. Failed tool call and embedding spans now show the standard error block (message plus stack trace) below the Input section.

Root cause

Generic spans render exception span events via the SpanEvents component, but the AI-specific span entities replace the whole panel with their own layout and dropped the events entirely. The span's events are now passed into AIToolCallSpanDetails and AIEmbedSpanDetails and rendered with the same SpanEvents component the generic view uses.

Errored generation spans (ai.generateText and friends) use a tabbed view and still don't surface errors; that needs its own design pass and is left for a follow-up.

[coderabbitai]

Caution

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[devin-ai-integration]

✅ Devin Review: No Issues Found

Devin Review analyzed this PR and found no bugs or issues to report.