[FEATURE] Desktop app: Favorites section in the folder picker (pin, custom order, custom display names)

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

The folder picker above the chat input in the desktop app (Code tab) only shows "Recent" folders, ordered by last use. When working across many projects, the folders I use most are constantly pushed down or out of the list by one-off folders (temp folders, test repos, short-lived forks).

On top of that, several of my project folders share the same name: e.g. one "Standard" folder per product version (v6.0\Standard, v7.0\Standard, v7.1\Standard ...). The picker shows only the folder name, so the entries are ambiguous and it's easy to start a session in the wrong version's source tree.

Proposed Solution

Add a "Favorites" section at the top of the folder picker, visually separated from "Recent" by a separator line above and below it.

• Mark as favorite: a star/pin icon appears when hovering an entry under "Recent"; clicking it adds the folder to Favorites
• Custom order: drag & drop (or move up/down) inside Favorites, independent of last use
• Custom display name: rename a favorite (e.g. "Product v7.1 Standard" instead of "Standard"); the full path is shown as a tooltip or secondary line
• Remove: an "x" on each favorite to unpin it

Favorites persist across app restarts and updates and are never evicted by the Recent list's cap or ordering.

Alternative Solutions

Alternative: make the folder picker extensible by mods (plugin hooks), so users can build this themselves.

Mods can currently only render inside a running session (AbovePrompt, Pane, transcript components). The folder picker is app chrome shown before any session exists, so no mod can reach it. What would be needed:

• a renderable component for the picker (e.g. ui.render with component 'FolderPicker'), or a hook that receives the folder list and returns it modified (extra sections, separators, ordering, display names, hidden entries)
• an action a mod can call to select a folder / start a session in a given folder
• mods loaded at app level (not only per session), with $.store available to persist the list

Current workaround: none inside the app. I'd have to keep a separate list of paths and use "Open folder..." each time, which defeats the purpose of the picker.

Priority

Medium - Would be very helpful

Feature Category

Other

Use Case Example

1. I maintain one product in several versions, each with its own source tree containing a "Standard" folder, plus a few tool repos and customer-specific forks.
2. I pin the 5 folders I use daily and rename them, e.g. "v7.1 Standard", "v7.0 Standard", "Status App", "Tools".
3. I order them by importance: the current version first.
4. Every new session: open the picker, the favorites are at the top in my order with clear names, one click, done.
5. One-off folders (tmp, a customer fork I looked at once) still appear under "Recent" but never displace my favorites.

Additional Context

Related issues (none covers this request completely):

• #95472: Recent list capped at 8; mentions pinning as one possible fix, but no custom names/order
• #72181: no way to remove entries from the Recent list
• #67249: remember recent directories; favorites only as an optional extra (closed as not planned)

Platform: Windows 11, Claude desktop app, Code tab.