Two fixes for tool call display in the dashboard:
1. **filterDisplayMessages includes tool_calls** (MessageBubble.js)
Previously filtered out messages with only tool_calls (no content/thinking).
Now correctly keeps messages that have tool_calls.
2. **Type-safe getToolSummary** (markdown.js)
The heuristic tool summary extractor was calling .slice() without
type checks. If a tool input had a non-string value (e.g., number),
it would throw TypeError. Now uses a helper function to safely
check types before calling string methods.
Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
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