[FEATURE] Sort /resume session picker by last activity date + session titles in conversation language

Preflight Checklist

• [x] I have searched existing requests and this feature hasn't been requested yet
• [x] This is a single feature request (not multiple features)

Problem Statement

When using /resume or claude --resume, sessions are sorted by creation date. When I resume an older session and work on it extensively, it stays at its original position in the list instead of moving to the top. This makes it hard to find recently-worked-on sessions.

Additionally, session titles are always auto-generated in English, even when the conversation is conducted entirely in another language (in my case, Dutch). This makes sessions harder to identify at a glance.

Proposed Solution

1. Sort the /resume session picker by last activity date (most recently active first) instead of creation date
2. Auto-generate session titles in the language the conversation is conducted in

Alternative Solutions

_No response_

Priority

Critical - Blocking my work

Feature Category

CLI commands and flags

Use Case Example

I work on multiple features across sessions spanning days or weeks. When I pick up an older session, I expect it to appear at the top of my list next time, just like any file manager or chat app would. Currently I have to scroll through or search for it.

For the language issue: all my conversations are in Dutch, but titles are generated in English, creating a disconnect that makes sessions harder to scan.

Additional Context

_No response_