Add Related Activity ID sibling and parent-activity lenses

[jschick04]

What

Extends the filter-lens stack with two RelatedActivityId-driven lenses, reachable from the event context menu:

• Show Events Sharing Related Activity ID - narrows to events that share this event's RelatedActivityId (siblings of the same parent/correlation activity). Encoded as an exclude of RelatedActivityId != X; because NotEqual on the nullable-Guid column is total, absent-RelatedActivityId rows are hidden, not leaked.
• Show Parent Activity - jumps to the parent activity's events: those whose ActivityId equals this event's RelatedActivityId. Reuses the ActivityId lens with a distinct "Parent Activity = {guid}" chip label.

Both are gated on RelatedActivityId.HasValue, thread OwningLog for owning-log auto-clear, and are transient/reversible like the existing Activity-ID lens.

Refactor

• Extracted FilterLensFactory.BuildEqualityLens so ForActivityId, ForRelatedActivityId, and the parent jump share the single exclude-of-complement (total-operator) encoding.
• ForActivityId gains an optional display-only label param (defaults to prior behavior).
• Extracted FilterLensCommands.PushLens (shared dispatch guard).

Tests

Adds compose tests empirically proving (A) absent-RelatedActivityId is hidden and (B) the parent jump narrows by ActivityId (keeps the parent, not the child), plus command tests for both new commands (label/field discriminators, null no-op, owning-log tagging). Runtime 1687, UI 1038; Release build clean.

[Copilot]

Pull request overview

This PR extends the filter-lens feature to support navigation and grouping based on RelatedActivityId, adding two new context-menu actions: one to show sibling events sharing the same RelatedActivityId, and one to jump to the parent activity’s events (where ActivityId == RelatedActivityId). It also refactors lens creation/dispatch to reuse a single “exclude-of-complement” encoding for nullable-Guid equality narrowings, and adds tests to lock in the intended semantics.

Changes:

• Add two new lens commands: “Show Events Sharing Related Activity ID” and “Show Parent Activity”, both gated on RelatedActivityId.HasValue and tagged with OwningLog for auto-clear.
• Refactor lens construction via FilterLensFactory.BuildEqualityLens and centralize push/dispatch null-guarding in FilterLensCommands.PushLens.
• Expand unit coverage to validate parent-jump field mapping and that absent RelatedActivityId rows are hidden (not leaked) under the total NotEqual semantics.

Reviewed changes

Copilot reviewed 7 out of 7 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
tests/Unit/EventLogExpert.Runtime.Tests/FilterLenses/FilterLensCommandsTests.cs	Adds command-level tests for the two new lens commands (dispatch behavior, labels, null no-op, origin log tagging).
tests/Unit/EventLogExpert.Runtime.Tests/FilterLenses/EffectiveFilterBuilderTests.cs	Adds compose tests proving parent-jump narrows by ActivityId (not RelatedActivityId) and that absent RelatedActivityId is hidden under the exclude-of-complement encoding.
tests/Shared/EventLogExpert.Filtering.TestUtils/FilterEventBuilder.cs	Extends test event construction to set ResolvedEvent.RelatedActivityId.
src/EventLogExpert.UI/LogTable/LogTablePane.razor.cs	Adds two new context-menu items that invoke the new lens commands, gated on RelatedActivityId.HasValue.
src/EventLogExpert.Runtime/FilterLenses/IFilterLensCommands.cs	Extends the commands interface with ShowParentActivity and ShowRelatedByRelatedActivityId.
src/EventLogExpert.Runtime/FilterLenses/FilterLensFactory.cs	Refactors lens creation into a shared BuildEqualityLens and introduces ForRelatedActivityId; adds optional label override to ForActivityId.
src/EventLogExpert.Runtime/FilterLenses/FilterLensCommands.cs	Implements the new commands and extracts a shared PushLens helper for null-guarded dispatch.

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