Add expandable runtime warning details to the work log

[justsomelegs]

What Changed

• Added expandable details for runtime.warning entries in the work log.
• Kept the collapsed row compact and consistent as Runtime Warning.
• Made the warning row itself clickable, with the chevron acting as open/closed state only.
• Rendered expanded warning content inline without the extra bordered container or duplicate WARNING label.
• Preserved the existing server-side truncation guard for warning messages.
• Capitalized the stored warning summary from Runtime warning to Runtime Warning.

Why

runtime.warning entries were hard to use in the work log because they only surfaced a generic label with no way to inspect the underlying warning context inline. This change keeps the timeline compact by default, but makes warning details available on demand in a way that matches existing UI patterns.

I kept the server-side truncation in place because removing it made the persisted activity payload unbounded, which is a bad tradeoff for a work-log projection. keeps the change focused on UI ergonomics instead of changing runtime payload size behavior.

UI Changes

• Collapsed state: warning rows continue to appear as a compact Runtime Warning entry.

• Expanded state: clicking the row reveals the warning message and any structured detail inline beneath it.

Checklist

• This PR is small and focused
• I explained what changed and why
• I included before/after screenshots for any UI changes
• I included a video for animation/interaction changes

Note

Add expandable runtime warning details to the work log

• Adds collapsible runtime warning rows in the work log: a toggle button reveals the warning message and structured detail, collapsed by default.
• Introduces runtimeWarningMessage and runtimeWarningDetail fields on WorkLogEntry in session-logic.ts; runtime warning entries no longer populate the generic detail field.
• Adds normalizeRuntimeWarningMessage and formatRuntimeWarningDetail utilities in MessagesTimeline.tsx to handle whitespace-only messages and non-string detail values (pretty-printed JSON).
• Suppresses preview text for entries that have renderable runtime warning metadata.
• Behavioral Change: runtime warning work log entries now use activity.summary as their label (capitalized "Runtime Warning") and omit the generic detail field.

^{Macroscope summarized a8ea52b.}

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[macroscopeapp]

Approvability

Verdict: Needs human review

1 blocking correctness issue found. This PR introduces a new user-facing feature with collapsible UI components and new data propagation paths. Additionally, an unresolved review comment identifies a potential bug where entries with whitespace-only warning messages could render with no visible information.

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