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 handling and pure selection logic; no auth, data, or API changes.

Overview
Tab in the command palette path browser now accepts a directory suggestion instead of moving focus out of the input.

While browsing, plain Tab is intercepted and routed through new resolveBrowseTabCompletion: highlighted row (including .. → parent) wins, then a case-sensitive exact name match on the filter, then the first filtered directory. browseUp / browseTo apply the choice; Tab does nothing when matches are still loading or a relative path needs an active project.

^{Reviewed by Cursor Bugbot for commit dc90a36. Bugbot is set up for automated code reviews on this repo. Configure here.}

Note

Add Tab key completion to the path browser in Command Palette

• Pressing Tab while browsing in the Command Palette now completes the current path instead of moving focus to the next UI element.
• Completion priority: highlighted entry > exact case-sensitive match > first filtered entry; pressing Tab on the parent-directory row triggers browseUp.
• Adds resolveBrowseTabCompletion in CommandPalette.logic.ts with full unit test coverage in CommandPalette.logic.test.ts.
• Behavioral Change: default Tab focus behavior is suppressed whenever the palette is in browse mode.

^{Macroscope summarized dc90a36.}

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[macroscopeapp]

Approvability

Verdict: Needs human review

This PR introduces a new user-facing feature (Tab completion in the path browser) that changes how users interact with the command palette. New interactive capabilities warrant human review even when well-tested and self-contained.

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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 a7ae59d. Configure here.}