fix: sort v2 session list by updated time

[Hona]

TL;DR: "Load more" looked random because the backend and sidebar disagreed on what "newest" meant.

From the actual local DB investigation, the API was selecting/paginating root sessions by created time, but the app sidebar displays sessions by updated time. That means a session created days ago but touched recently can be outside the first page, then appear near the top after clicking Load more. Concrete example from the repro data: "fix: ResizeObserver crash" now ranks #7 by updated time in C:\Repos\sst\opencode, so it belongs in the initial page.

Per review feedback, this removes the proposed sort parameter and just flips v2 session list ordering to updated time. Nothing was using the v2 endpoint yet.

Summary:

• Sort v2 session list pagination by updated time.
• Encode cursor boundaries with updated time.
• Trim app sidebar root sessions by updated order.

Diff size:

• 3 files
• 10 insertions / 8 deletions

Validation:

• Verified against real local DB: 697 root non-archived sessions, target session rank feature: Interactive Configuration #7, page 2 all below page 1 by updated time.
• bun test src/context/global-sync.test.ts src/context/global-sync/session-trim.test.ts (packages/app)
• bun test --timeout 30000 test/server/httpapi-session.test.ts (packages/opencode)
• bun typecheck (packages/opencode, packages/app)

[Copilot]

Pull request overview

Fixes inconsistent ordering between the v2 session list API and the app sidebar. The backend was paginating root sessions by creation time while the sidebar sorted by update time, causing recently-updated older sessions to skip the first page and reappear after "Load more". This change switches the v2 session list query/cursor and the app's trim logic to consistently order by update time.

Changes:

• v2 session.list orders, cursor comparisons, and the start filter now use time_updated instead of time_created.
• Encoded session cursor now stores time as epoch ms of session.time.updated.
• trimSessions sorts root sessions by compareSessionRecent (updated time) before slicing.

Reviewed changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated no comments.

File	Description
packages/opencode/src/v2/session.ts	Switch list query ordering, cursor boundary, and start filter to time_updated.
packages/opencode/src/server/routes/instance/httpapi/handlers/v2/session.ts	Encode cursor time from session.time.updated via DateTime.toEpochMillis.
packages/app/src/context/global-sync/session-trim.ts	Sort root sessions by recency before trimming.

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