--continue selects wrong session due to incorrect sort order in sync.tsx #5510

Description

Sessions are sorted by ID string comparison (a.id.localeCompare(b.id)) but session IDs use descending timestamp encoding (newer sessions have lexicographically smaller IDs via Identifier.descending()). This causes --continue to select an old/stale session instead of the most recently updated one.

Root cause:
packages/opencode/src/cli/cmd/tui/context/sync.tsx:282
(x.data ?? []).toSorted((a, b) => a.id.localeCompare(b.id))

Fix:
Sort by timestamp instead:
(x.data ?? []).toSorted((a, b) => b.time.updated - a.time.updated)

OpenCode version

1.0.152 (built from source, dev branch)

Steps to reproduce

1. Have multiple sessions (created over several hours/days)
2. Run opencode --continue
3. Observe that it opens an old session instead of the most recently updated one

Screenshot and/or share link

No response

Operating System

Pop!_OS 22.04 LTS

Terminal

Zed IDE integrated terminal