Feature: increase /resume session list limit beyond 50

Problem

The /resume session picker currently has a hardcoded limit of 50 sessions (gmT = 50 in the source). For power users who accumulate hundreds of sessions across profiles, only the 50 most recent are visible in the picker UI.

While the search function (/ in the picker) does search across all sessions, there's no way to browse or paginate beyond the initial 50.

Current behavior

• /resume shows at most 50 sessions (sorted by most recent)
• The picker displays 1/50 — users may not realize older sessions exist
• The source has a nextIndex return value suggesting pagination was planned, but the UI doesn't expose a "load more" mechanism
• No configuration option exists to change this limit

Proposed solution (any of these would help)

1. Configurable limit: Allow users to set the session list size via settings (e.g., "resumeLimit": 100)
2. Pagination / load more: Expose the existing nextIndex mechanism in the UI so users can load older sessions
3. Increase the default: Bump the default from 50 to a higher number (e.g., 200)

Context

• Tested on Claude Code v2.1.78 (macOS, arm64)
• User has 400+ sessions across multiple profiles
• The search workaround helps but requires knowing keywords from the session you're looking for