feat(speakers): play/pause toggle, 3-dot overflow menu, name autocomplete

[r3dbars]

Scope

Speakers settings screen only (header Speakers / "Name new voices and manage the people in your meetings" / "N voices to name"). No Home/meeting surfaces touched — that area belongs to #1134.

All changes live in the voice-to-name rows of Sources/UI/Settings/SpeakerPeopleSettingsSection.swift plus three new files.

Changes

1. Play/pause toggle with a clear active state

• The circular play button renders through a new pure SpeakerClipPlaybackPresentation (play ⇄ pause glyph) and gains an accent ring while playing; the whole row gets a subtle accent highlight so the playing clip is obvious among many.
• Only one clip plays at a time, and the button returns to play on finish — both already guaranteed by SpeakerClipPlayback (stops the prior sound on a new clip; posts a state-change notification every row observes).

2. Three-dots overflow menu (replaces the bare transcript icon)

• After Save Name, an ellipsis menu with:
  • Show transcript — same reveal the old doc.text icon did (openTranscript).
  • Delete voice — wired to the real SpeakerDatabase.deleteSpeaker path via model.deleteVoice, behind a destructive confirmation. The delete is verified (getSpeaker(id:) == nil) and surfaces an error in-row if it didn't actually remove the voice — never a silent no-op.

3. Autocomplete in the "Who is this?" field

• New SpeakerNameAutocompleteField wraps NSComboBox and reuses the existing SpeakerNameSelectionPolicy (the same matching/inline-completion the post-meeting SpeakerNamingSheet uses).
• Suggestions are built from named profiles by the pure SpeakerNameSuggestionSource (excludes the voice being named and unnamed/blank profiles).

Tests

• New Tests/SpeakerVoiceRowPresentationTests.swift (8 suites): play/pause state machine, active-highlight rule, a11y/help copy, overflow-menu action ordering + destructive flag, delete-never-silent error mapping, and the autocomplete data source (incl. reuse of SpeakerNameSelectionPolicy inline completion).
• Wired into Tests/FastTests.manifest + run-tests.sh APP_SOURCES.
• bash run-tests.sh → 5439/5439 pass. bash build.sh --no-open → clean, perf budget OK.

Manual click-test still needed (real-app UI behaviors)

• Play one clip → button shows pause + row highlights; start a second → first resets to play; let a clip finish → returns to play.
• Overflow → Show transcript opens the originating meeting; Delete voice confirms, removes the voice, refreshes the list; force a failure (e.g. locked DB) → in-row error shows.
• Type in Who is this? → suggestions + inline completion match existing speaker names; selecting a decorated label stores the plain name; Enter saves.

Peer / collision notes

• Speaker-naming simulator + same-voice consolidation to cut speakers-to-name #1114 (Core speaker-naming consolidation): no file overlap; complementary.
• fix: make Home meeting reveal/delete robust to stale row paths #1134 (Home thread): shares append-only edits to FastTests.manifest and run-tests.sh — different regions, should auto-merge; whoever lands second may need a trivial rebase.

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