Use quiet capture icons in the menu bar

[r3dbars]

What changed

• Meeting recording now uses the neutral template symbol record.circle instead of a filled red recording symbol.
• Active dictation now uses the neutral template symbol waveform instead of a red microphone.
• Accessibility labels still say recording meeting and dictating.
• Red remains on the destructive Stop controls inside the open menus.
• Apple-controlled microphone, system-audio, and camera privacy indicators are untouched.

Why

The always-visible red status-item symbols were conspicuous when the user shared an entire display. Transcripted owns these icons, so the smallest fix is to keep distinct silhouettes while removing the baked-in red treatment.

Visuals

• Before: current meeting recording mock
• Approved proposal: neutral meeting and waveform dictation mock

The visuals are synthetic and contain no transcript or audio content.

Validation

• bash build-deps.sh --force
• bash build.sh --no-open
• bash run-tests.sh --filter StatusItemPresentationTests — 6/6 passed
• bash run-tests.sh — 12,138/12,138 passed

The deterministic test pins both symbol mappings, their accessibility labels, template rendering, removal of the red status-item treatment, and runtime SF Symbol availability.

Proof boundary and manual QA

This change reduces unnecessary visual exposure when the macOS menu bar is included in a whole-display share. It does not hide the status item or suppress Apple's privacy indicators. Existing NSWindow.sharingType = .none assignments are defense-in-depth only and are not treated as captured-pixel proof.

Still validate with synthetic text and no real transcript/audio content:

1. Zoom, Google Meet, and Microsoft Teams: share the whole display and confirm the neutral meeting/waveform icons are visible but unobtrusive.
2. Repeat each provider with window-only sharing and confirm the menu bar is absent as controlled by the provider.
3. QuickTime whole-screen recording: confirm the same icon behavior.
4. Locally open the Transcripted menu while meeting recording and dictating; confirm the red Stop actions and accessible labels remain unmistakable.

Independent review

codex review --base origin/main exited 0 with no actionable findings. The reviewer rejected only a transient shared-build race caused by its own parallel build/test attempt; the required sequential rerun passed bash build.sh --no-open and all 12,138 fast tests.