Feature: Add File Browser Functionality to Everything Search

[cheepsahoy]

Browse Folders, Too!

Everything Search is so much help, but sometimes our knowledge of a file is geographic instead of nominal. What do you do if you know where something is, but not what its called? Before, you'd have to open an explorer/finder, or use card mirror's existing open-file interface. Now, with fileBrowser, you can navigate to that folder from within card mirror!

What it adds

This PR adds a new functionality to the Search Everything palette designed to navigate to and through folders.

"browse" mode is accessible by the search-prefix /

Upon typing, users are sent to the 'roots' of the folders configured for File Search.

Users can also jump to the 'current' folder that houses the file currently open by adding a c to the prefix, i.e.,: /c If that file isn't within a configured root folder for File Search, the user will be told that jumping to that file's folder is impossible.

Users can navigate the folder by clicking/tabbing, and can go "up" a folder by pressing esc.

Once at a folder, users can access / interface with the files in that folder as if the file was found through f search. All functionality is preserved. Browse folder uses f search's existing index system to find file paths. Folders are only shown if they have files inside that are accessible by f search

[ant981228]

Merged — thank you for this! Browsing by place rather than by name was a real gap, and the approach of deriving folders from the existing index (so nothing new touches the filesystem) was exactly right.

Before merging I reworked it into the palette's prefix model so it behaves like the other prefixes. What changed, in case you're curious:

• / and /c are now space-terminated prefixes like f and q . A bare / shows a hint until the space arrives.
• Text after the prefix searches the folder you're in — every file beneath it at any depth (each row shows its subfolder), plus subfolders whose name matches — using the same matcher as f search.
• Enter/Tab into a folder and Esc up both clear the query; only a change of prefix relocates (so after /c you can navigate away and keep typing without being pulled back; deleting the c returns to the roots).
• The listing logic moved into src/editor/file-browse.ts, a pure separator-agnostic helper shared by the index service and the palette's test fake. That also fixed the typecheck failure (the fake didn't implement the two new client methods), which CI would have caught had it been able to run on a first-time contributor's branch.
• Tests added for the helper, the service, and the palette flow; manual and changelogs updated.

It's on main now and will ship with the next release. Thanks again!