feat: group by caller namespace across data-table views

[lukecotter]

📝 PR Overview

Adds a Group by Caller Namespace option across the Analysis, Bottom-Up, SOQL, and DML views, so users can see at a glance which package's code is responsible for activity in other namespaces (especially useful when SOQL/DML runs in default but was triggered by a managed package).

Also aligns the Bottom-Up and Analysis toolbars to a consistent Actions → Filters → Group order, applies the Details filter on Bottom-Up (previously skipped), and fixes a Tabulator expand/collapse crash on Bottom-Up.

🛠️ Changes made

• Add a getCallerNamespace(event) utility (log-viewer/src/core/utility/CallerNamespace.ts) that returns the namespace of an event's direct parent (memoized).
• Add a hidden callerNamespace field on AggregatedRow, BottomUpRow, and MergedCalltreeRow so it's available for grouping without taking up a visible column.
• Add Caller Namespace to the group-by dropdown on Analysis, Bottom-Up, SOQL, and DML; route the label to the callerNamespace field.
• Reorder Analysis and Bottom-Up toolbars to Actions → Filters → Group for consistency.
• Apply the Details filter on Bottom-Up too (was Time Order / Aggregated only).
• Extract expandCollapseAll into a shared util (features/call-tree/utils/ExpandCollapse.ts) that gates recursion on row.getTreeChildren().length — tolerates uninitialised rows under Tabulator's virtualisation rather than crashing in DataTree.expandRow.
• Extract makeShowDetailsFilter into a shared util (features/call-tree/utils/DetailsFilter.ts).
• Hover tooltip on the raw-log "Show in Log Analysis" link now reads Reveal event in timeline instead of the raw command: URI.

🧩 Type of change (check all applicable)

• 🐛 Bug fix - something not working as expected
• ✨ New feature – adds new functionality
• ♻️ Refactor - internal changes with no user impact
• ⚡ Performance Improvement
• 📝 Documentation - README or documentation site changes
• 🔧 Chore - dev tooling, CI, config
• 💥 Breaking change

🔗 Related Issues

resolves #604

✅ Tests added?

• 👍 yes

Added CallerNamespace.test.ts covering strict-direct-parent semantics and memoisation. Existing Aggregation and call-tree tests cover the new callerNamespace field path. 846/846 pass.

📚 Docs updated?

• 🔖 README.md
• 🔖 CHANGELOG.md
• 📖 help site

Anything else we need to know?

The Bottom-Up Expand/Collapse fix uses getTreeChildren().length > 0 as a guard rather than calling treeExpand blindly. This is a workaround for an upstream Tabulator inconsistency: DataTree.expandRow/collapseRow/toggleRow access row.modules.dataTree.children without guarding config, while the sibling getTreeChildren does guard. Under virtualisation (Tabulator's default), off-screen rows never get row-init, so modules.dataTree is undefined and expandRow throws. Proper upstream fix would be lazy-initialisation inside those three methods. Tracked in our tabulator_known_bugs.md memory note.