fix: add tooltip to truncated span names in HTML report

[thomhurst]

Summary

• Adds a title attribute to the .sp-name span element in the trace timeline so that truncated span names show the full name on hover
• The CSS already applies text-overflow: ellipsis to long span names, but there was no way to see the full text

Test plan

• Open an HTML report with long span names (e.g. hook: TestHooks.LogTestResult...)
• Hover over the truncated name and verify the full name appears as a tooltip

[claude]

Code Review

This is a clean, minimal fix that improves UX without any downsides.

What the change does

Adds a title attribute to the .sp-name span so browsers display a native tooltip with the full span name on hover — matching the existing behavior already applied to the .sp-bar element on the same row.

Observations

Consistency — The .sp-bar div immediately after this span already had a title attribute (esc(s.name) + ' (' + fmt(s.durationMs) + ')'). This change brings the label span in line with that pattern, making the tooltip behavior consistent across both visual representations of the same span.

Correctness — esc(s.name) is used for both the content and the title attribute value, which is correct. HTML-escaping special characters in attribute values prevents attribute injection (e.g. if a span name contains ").

Minimal footprint — Single-character change (+1/-1). No logic changes, no risk of regression.

Suggestion (minor, optional)

The tooltip on .sp-bar shows duration alongside the name (esc(s.name) + ' (' + fmt(s.durationMs) + ')'). You could optionally do the same here for extra context, but the current approach is perfectly fine — the duration is already visible in the adjacent .sp-dur span.

Approved as-is. Good catch that the label was missing this while the bar already had it.