Add collapse/expand context menus for Bases Task List views

[renatomen]

Summary

Adds collapsible groups and subgroups to Bases Task List grouped views, controlled via context menus and a configurable default collapsed state.

Context Menus

• Right-click a primary group header: expand/collapse its subgroups
• Right-click empty view area: expand/collapse all groups, or all groups and subgroups

Default Collapsed State

• New "Default collapsed state" dropdown view option (Expanded/Collapsed)
• Collapse state is preserved across re-renders via ephemeral state

Other Fixes

• View options now re-read on every render so config changes take effect without restarting Obsidian
• Search box is properly torn down when enableSearch is toggled off
• Fixed expandedRelationshipFilterMode dropdown (Bases returns array indices as strings for string[] dropdowns)

Commits

1. fix: Correct expandedRelationshipFilterMode dropdown value comparison
2. feat: Add collapse/expand ALL GROUPS/SUBGROUPS option to context menus
3. docs: Add demo animation

[renatomen]

Rebase note (TaskNotes 4.8.1)

@callumalpass

Conflict resolutions of note:

• src/bases/TaskListView.ts — Main had extracted buildTaskListGroupedRenderItems, buildTaskListSubPropertyRenderItems, buildTaskListPathProperties, and groupTasksByTaskListSubProperty into taskListGrouping.ts, with the first two already accepting collapsedGroups/collapsedSubGroups. Dropped the feature's now-redundant private buildGroupedRenderItems/buildSubPropertyRenderItems/buildPathToPropsMap/groupTasksBySubProperty and rewrote createGroupedHierarchySnapshot to use the extracted helpers. Kept the feature's applyGroupingSnapshot + isSubGroupKey/setSetEntry helpers (needed for collapse-all).
• src/bases/BasesViewBase.ts — Main split this file into many basesXxx helper modules. Kept main's version and surgically re-added the feature's intent: searchContainerEl field, teardownSearch() method, and tear-down-on-disable path.
• src/bases/registration.ts — Adapted to main's multi-arg registerBasesView(plugin, id, config, logger) signature.

One behavioral delta worth flagging: refreshGroupedView now calls applySearchFilter/setCurrentVisibleTaskPaths before building items. Main's version didn't filter on toggle, which would have made hidden tasks reappear after collapse/expand when search is active. Happy to back this out if you'd rather keep main's pre-existing behavior.