fix(web): avoid repeated session list scans in sidebar computeds

[wbxl2000]

Related Issue

No linked issue — the problem is explained below.

Problem

With many sessions, the web sidebar visibly stutters. A Chrome Performance recording shows animation-frame tasks of ~87–89 ms against a 16.7 ms frame budget at 60 Hz. Bottom-up attributes ~60 ms (71.5% of the selected range) to isSessionEffectivelyRunning() re-running rawState.sessions.find(): the three sidebar list computeds (sessions, sessionsForView, workspaceGroups) each re-scan the whole reactive session array once per row, so the per-frame work grows roughly quadratically with the session count.

What changed

isSessionEffectivelyRunning() now takes the AppSession object the caller already holds instead of a session id:

• sessions, sessionsForView, and workspaceGroups pass the row's session directly — no more per-row find() over the whole list.
• activity (active session only, outside any list loop) keeps a single explicit find() and passes the result in.
• Not-found still returns false; the BTW side-chat, running-task, and tasks-not-yet-loaded rules are untouched, so all spinner behavior is identical.
• No new caches, maps, exports, or modules; this is the minimal fix. Remaining smaller hotspots (workspaceIdForSession, toSorted) are intentionally left for a follow-up only if profiling still shows long tasks.

Checklist

• I have read the CONTRIBUTING document.
• I have linked a related issue, or explained the problem above.
• Behavior is unchanged and covered by the existing test suite (25 files / 380 tests pass); typecheck and production build pass. This is an internal data-passing change, so no new test file was added.
• Ran gen-changesets skill, or this PR needs no changeset.
• Ran gen-docs skill, or this PR needs no doc update — internal performance fix with no user-facing behavior change.

[changeset-bot]

🦋 Changeset detected

Latest commit: 4086b95

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 1 package

Name	Type
@moonshot-ai/kimi-code	Patch

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commit: 4086b95