Disambiguate Add Project picker Add button — show what will be added

[Invictine]

Problem

In T3 Code desktop, Add project opens an in-app folder picker (~/ with a Directories list). The top-right button just says Add Ctrl Enter while a subfolder (e.g. AppData) is highlighted.

It's ambiguous whether Add adds:

• the currently browsed folder (~/), or
• the highlighted subfolder (~/AppData)

There is no selected-path preview, so it's easy to add the wrong folder (e.g. home dir or AppData) by accident. Enter (open/navigate) vs Ctrl+Enter (add) is also undiscoverable — footer only says Navigate / Select / Back / Close.

Proposal (smallest useful scope)

1. Footer preview: Will add: C:\Users\you\AppData that updates as highlight moves.
2. Dynamic button label: Add "AppData" or Add Folder as Project instead of bare Add.
3. If nothing is highlighted, Add adds the current folder and the footer says so.
4. Clarify hints: Enter Open / Ctrl+Enter Add / Backspace Back / Esc Close.

No new picker, no scaffolding — just label + preview.

Why it matters

Prevents mis-added project roots and re-adding/cleanup churn. Classic folder-picker pitfall.

Related

• [Bug]: macOS add-project flow forces folder picker and prevents manual path entry / viewing hidden folders #1312 (macOS add-project forces picker, no manual path) — closed, adjacent
• Add Project browser and path autocomplete omit symlinked directories #8408 (picker omits symlinked dirs) — open
• Unify the new thread project picker #4263 (unify new-thread project picker) — open

Happy to help test. Labels: enhancement, ux, good-first-issue.

[Invictine]

Fixed in my fork: Invictine/t3code branch fix/add-picker-submit-highlighted (https://github.com/Invictine/t3code/tree/fix/add-picker-submit-highlighted).

What changed (web, CommandPalette browse mode):

• Submitting with a directory row highlighted (Ctrl/Cmd+Enter or the Add button) now adds the highlighted folder, not the browsed parent. Previously the highlight was ignored and the query-derived parent path was added — the exact ambiguity in the screenshot.
• The button now reads Add <folder> and the tooltip/aria announces the full path (Add <fullpath> (Ctrl+Enter)), so it always states what will be added. The .. row still navigates; clone-destination flow behavior is unchanged.
• Pure helpers (getHighlightedBrowsePath, getBrowsePathLeaf, resolveBrowseSubmitPath) live in CommandPalette.logic.ts with tests; mobile uses a plain path-input submit so it is unaffected.

Verified: vp test run CommandPalette.logic.test.ts 26/26 pass, web tsgo --noEmit clean, vp lint clean (2 pre-existing warnings elsewhere). Happy to open an upstream PR if maintainers want it.