[BUG] /resume command shows oldest sessions first, making recent sessions inaccessible

## Environment

• Platform (select one):
• [x] Anthropic API
• [ ] AWS Bedrock
• [ ] Google Vertex AI
• [ ] Other: <!-- specify -->
• Claude CLI version: <!-- output of claude --version -->
• Operating System: <!-- e.g. macOS 14.3, Windows 11, Ubuntu 22.04 -->
• Terminal: <!-- e.g. iTerm2, Terminal App -->

## Bug Description
When using the /resume command with a large number of stored sessions (550+), the terminal displays the bottom
of the session list showing the oldest sessions, while the most recent sessions are above the visible viewport and
require manual scrolling to access.

## Steps to Reproduce

1. Accumulate 550+ stored sessions over time
2. Type /resume in Claude Code interactive mode
3. Observe that the terminal shows the bottom of the list (oldest sessions)
4. Note that recent sessions are not visible without scrolling up

## Expected Behavior
Recent sessions should be easily accessible by either:

• Displaying sessions in reverse chronological order (newest first)
• Auto-scrolling to show the top of the list where recent sessions are located
• Providing an option to control the display order

## Actual Behavior

• Sessions are listed in chronological order (oldest to newest)
• Terminal viewport shows the bottom of the list
• Most recent sessions are hidden above the visible area
• No built-in way to reverse the order or jump to recent sessions

## Additional Context

• Current workaround requires extensive manual scrolling through 550+ sessions
• This significantly impacts workflow when trying to resume recent work
• A reverse chronological order would align with common UX patterns where most recent items appear first