Feature request: '/' to open a search/filter bar in /diff file picker (consistent with /plugin, /config)

Feature request

Add a / hotkey to the /diff command's file picker that opens a search/filter input — same affordance as /plugin and /config, where pressing / jumps focus to a search bar that incrementally filters the list.

Why

/plugin and /config both expose this pattern: / opens a search bar, typing filters the list in place, Esc returns to navigation. It's already the muscle memory for navigating long lists in the CLI.

/diff is the spot where it's most needed in practice — a 23-file diff (or any non-trivial change set) is hard to navigate with arrow keys alone. With filter, the file you want is one substring away.

Repro

1. In a repo with many changed files, run /diff.
2. Press / — nothing happens; there's no way to filter the list.
3. Compare against /plugin and /config, where / opens a search bar.

Screenshot

!/diff file picker — note the footer offers only ↑/↓ navigation, no / to search

Ask

Wire / to open a filter input in the /diff picker, matching the behavior in /plugin and /config:

• / opens the search bar with focus
• Typing filters the file list (substring or fuzzy — whichever matches the existing /plugin convention)
• Esc clears the filter and returns focus to the list
• Enter confirms the highlighted file

Ideally apply the same treatment to any other list screen that lacks it, so the /-to-filter contract is universal across navigable lists in the CLI.

Thanks!