Two small UIUX fixes for Cmd+K search.
1. Auto-highlight the first match while the user types. Before, Enter
on a non-empty query was a no-op — focusedIndex stayed at -1 until
the user pressed ↓. Standard search-palette behavior is to highlight
the top result so Enter just works. Empty query keeps -1 (opening
the dialog shows ALL workspaces; arbitrarily pinning one looks
wrong).
2. placeholder-zinc-400 → placeholder-ink-soft. The hardcoded zinc
broke the semantic-token pattern other inputs use; placeholder now
flips with theme correctly. (Also reordered focus:outline-none
ahead of the focus-visible variants — cosmetic, more idiomatic.)
Tests: replaced the "resets to -1" test with two new ones — auto-
highlight on a matching query (Enter selects without ArrowDown), and
no-results query stays a no-op. Full suite 1220/1220.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
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