Change cross-cutting hooks to shared modules and fix menu, thread and sheet regressions - #1367

Description

Adds a generalized useMatrixEvent hook, useAsyncAction/AsyncButton, a shared RoomMenu/useRoomMenuActions, and splits utils/room.ts into unread, relations, hierarchy and display modules with no barrel. Folds ThreadDrawer onto useTimelineActions and the shared renderer context, and moves the call feature into features/call/.

Also fixes regressions found while reviewing the stack: right-click menus not opening or not anchoring at the cursor, long-press opening the desktop popout instead of the mobile sheet, swipe-to-dismiss shrinking to the drag handle, bottom sheets losing their sheet styling and role="dialog", thread reactions double-reacting instead of redacting, the thread root being unrepliable, and the DM invite prompt never rendering.

Type of change

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• This change requires a documentation update

Checklist:

• My code follows the style guidelines of this project
• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• My changes generate no new warnings

AI disclosure:

• Partially AI assisted (clarify which code was AI assisted and briefly explain what it does).
• Fully AI generated (explain what all the generated code does in moderate detail).