feat: searchable run history panel with status and latency

[shaunpatterson]

What

A History button in the editor toolbar opens a searchable panel of past runs (like Memgraph Lab's Run History), newest first. Each row shows:

• action icon (query vs mutate, matching the existing QueryPreview icons),
• a status dot — green (completed without error), red (error), gray (never executed this session),
• a one-line monospace query snippet (whitespace-collapsed, 60-char ellipsis),
• server latency (formatted as ms) and relative time (react-timeago, already a dependency).

A search input filters rows by case-insensitive substring; clicking a row loads that query into the editor and activates the frame (same dispatches the existing history strip uses). Closes on outside click and Escape; the active frame's row is highlighted.

Implementation notes

• Pure helpers in lib/runHistory.js (summarizeFrame, filterFrames, formatLatencyMs) — status prefers the JSON tab result and falls back to any completed tab, so a query run only on the Visual tab still shows green/red.
• RECEIVE_FRAME now stamps createdAt (preserved if already present); legacy persisted frames without it fall back to the existing timestamp field or omit the time.
• The existing minimal history strip under the editor is left in place; this panel augments it.

Testing

31 unit tests on the helpers (status across tab results, latency formatting, snippet truncation, filtering). npm run build passes.

🤖 Generated with Claude Code

[shaunpatterson]