fix(web): preserve timed event stack order

[Uarmagan]

Summary

• Keep focused or newly selected overlapping timed events in their normal fan-out stack order.
• Preserve elevated stacking for active drag/resize motion.
• Update Day and Week regression coverage for focused, clicked, and draft overlap cases.

Root cause

Focused/edited events were being treated as if they should always jump to the highest layer. That made an overlapping event cover the rest of its stack immediately after create/save or selection.

Validation

• bun test --cwd packages/web src/views/Day/components/Calendar/DayCalendarGrid.test.tsx src/views/Week/components/Grid/MainGrid/MainGrid.test.tsx src/views/Week/components/Draft/grid/GridDraft.test.tsx
• bunx typescript@6.0.3 -p packages/web/tsconfig.app.json --noEmit
• bun lint
• Browser check against local compass2 web app: created overlapping Day events and confirmed they immediately fan out with normal stack order.