fix(web): respect manual session path collapse

[oodavy41]

Summary

Fix session list collapse behavior so a manually collapsed selected/running session path stays collapsed across live session-list refreshes.

Previously, when a selected active session kept receiving tool-call/message updates, the session list auto-expand effect would re-run on each refresh and immediately reopen the path the user had just collapsed. This made it difficult to collapse the current path and switch elsewhere to create or select another session.

Changes

• Gate selected-session auto-expand with a stable (selectedSessionId, group.key) ref.
• Auto-expand still runs when the selected session or its group changes.
• Preserve manual collapse state across live updates for the same selected session/group.
• Add regression coverage for:
  • keeping a selected running path collapsed across refreshes;
  • re-expanding when the selected session changes.

Notes

This intentionally keeps “reveal selected session” behavior when selection changes. If the user selects a different session in the same group, the group can auto-expand again by design.

Validation

• git diff --check origin/main..HEAD
• bun typecheck
• bun --cwd web test src/components/SessionList.directory-action.test.tsx src/components/SessionList.test.ts
• env -u HAPI_CLI_EXECUTABLE bun run test

Full suite passed.

[github-actions]

Findings

• No high-confidence issues found in the added/modified lines.

Summary

• Review mode: initial
• Reviewed the latest diff for web/src/components/SessionList.tsx and web/src/components/SessionList.directory-action.test.tsx. Residual risk: browser-only collapse behavior was not exercised locally because the test runner is unavailable in this environment.

Testing

• Not run (automation; bun not found in this runner).

HAPI Bot