feat(web): add Tab completion to path browser

[colonelpanic8]

Summary

• complete the highlighted directory when Tab is pressed in the path browser
• fall back to the first matching directory when no result is highlighted
• keep focus in the path input while matches are loading or unavailable
• preserve Tab navigation to the highlighted parent-directory entry

Why

The add-project and clone-destination path inputs already display matching directories, but Tab moved focus out of the input instead of accepting a suggestion. This makes the picker behave like a directory autocomplete and addresses #2160.

Validation

• pnpm exec vp test run apps/web/src/components/CommandPalette.logic.test.ts
• pnpm --filter @t3tools/web typecheck
• focused vp fmt --check and vp lint on the three changed files
• isolated exact-head browser verification of Tab completion against a disposable project (see evidence below)

Closes #2160

Exact-head evidence

Revalidated at 83ce1aa on current main (9a0a071): focused tests, vp check, and vp run typecheck passed. The capture uses only disposable local projects.

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Note

Low Risk
Localized command-palette keyboard and path-browse UX; no auth, data, or API surface changes.

Overview
Tab in the command palette path browser now accepts directory suggestions instead of moving focus out of the input (closes #2160).

A new resolveBrowseTabCompletion helper picks what Tab should do: go to the parent when .. is highlighted, enter the highlighted folder, prefer a case-sensitive exact name match, or—only when the user has typed a leaf filter—fall back to the first filtered directory. Without a leaf filter, Tab does not auto-enter the first child.

CommandPalette intercepts plain Tab in browse mode (preventDefault), calls that helper, and runs browseUp / browseTo. Tab is ignored while browse results are loading or a relative path needs an active project.

^{Reviewed by Cursor Bugbot for commit ee5da25. Bugbot is set up for automated code reviews on this repo. Configure here.}

Note

Add Tab key completion to path browser in Command Palette

• Adds resolveBrowseTabCompletion in CommandPalette.logic.ts to determine the Tab action while browsing: goes up when the parent-directory item is highlighted, enters the highlighted directory, falls back to an exact match, or enters the first filtered entry when a leaf filter is present.
• Wires Tab key handling into CommandPalette.tsx so pressing Tab (no modifiers) in browse mode triggers path navigation instead of inserting a tab character.
• Behavioral Change: Tab is now prevented by default in browse mode; existing keyboard behavior in non-browse modes is unaffected.

^{Macroscope summarized ee5da25.}

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[macroscopeapp]

Approvability

Verdict: Needs human review

This PR adds a new user-facing feature (Tab completion for path navigation) which introduces new interactive behavior. While the implementation is self-contained with good test coverage, new features changing user interaction patterns warrant human review.

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[cursor]

Cursor Bugbot has reviewed your changes using high effort and found 1 potential issue.

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^{Reviewed by Cursor Bugbot for commit 81d4357. Configure here.}