Refresh _NEXT.md with May 10 batch (audio + LAN + UI polish)

docs/superpowers/plans/_NEXT.md

@@ -96,14 +96,52 @@ Spec at `docs/superpowers/specs/2026-05-08-embedded-teams-orchestration.md`. All
 ### Tests
 - 78 unit tests passing; 9 NDI integration tests gated behind `--filter requires=ndi` (runtime probe, finder + sender lifecycle on default and custom groups, loopback discovery, full pipeline frame round-trip asserting 1080p normalization).
 
+## Done since May 10 hand-off
+
+### Engine
+- **Audio peak metering wired end-to-end.** `IsoHealthStats.PeakAudioLevel`
+  now reports real values from a sibling NDI audio capture loop in
+  `NdiReceiver`. New `INdiInterop.CaptureAudioPeak` method (default-
+  implemented for FakeNdiInterop, overridden in NdiInteropPInvoke).
+  `AudioPeakComputer` handles FLTP / FLT / PCM s16 with 14 unit tests
+  covering edge cases. UI VU bars in the participants DataGrid now
+  animate; the existing decay logic in `ParticipantViewModel` was
+  already in place waiting for real values.
+
+### Control surface
+- **LAN-reachable mode.** New checkbox in DISPLAY tab toggles whether the
+  REST/WebSocket surface and OSC bridge bind to `127.0.0.1` only or to all
+  interfaces (`http://+:port/`, `IPAddress.Any`). Settings panel surfaces
+  the routable URL with a Copy button (picker prefers physical NICs and
+  skips Tailscale / VPN tunnels / APIPA addresses). Use case: headless
+  host PC + thin client on the same LAN — operator runs Teams + TeamsISO
+  on a quiet machine, drives it from anywhere on the production network.
+  No auth — documented as a trusted-LAN-only mode. First-time bind
+  requires a one-shot `netsh http add urlacl`; the diagnostic warning
+  fires the exact remediation command if the bind fails.
+
+### UI polish
+- Visible hover affordances on every themed button (Ghost / Caption /
+  RailIcon / IsoToggle / Primary). Cyan accent borders + brighter fills
+  so mouse-hover and tab-focus give an unmistakable affordance regardless
+  of which dark surface the button sits on.
+- Keyboard focus rings (`IsKeyboardFocused` triggers) so tab-cycling
+  through the UI gives visual feedback (was nothing — `FocusVisualStyle`
+  was `x:Null` with no replacement).
+- ScrollBar restyled to slim transparent track + tinted thumb (Edge / VS
+  Code pattern) in place of the chunky Win9x default.
+- ContextMenu / MenuItem styled to match the dark canvas — right-click on
+  a participant row no longer shows the cream-colored Notepad popup.
+- ToolTip restyled: SurfaceElevated card with rounded corner + 320px
+  text wrap, replacing the cream Win98 popup.
+- Wd.Button.Primary disabled state distinct (was identical to enabled).
+
 ## Next
 
-1. **Smoke-test on real Teams.** Most of May's work hasn't run against a live meeting yet: the UIA in-call commands (mute / camera / share / leave) need their candidate-Name lists validated against the current Teams build, and the auto-apply-on-launch flow needs a real recurring meeting to confirm the 30-second grace window is right. Pin the AutomationIds for buttons we find — Name-based lookup is a starting point, AutomationId is what survives Teams UI updates.
+1. **Smoke-test on real Teams.** Most of May's work hasn't run against a live meeting yet: the UIA in-call commands (mute / camera / share / leave) need their candidate-Name lists validated against the current Teams build, and the auto-apply-on-launch flow needs a real recurring meeting to confirm the 30-second grace window is right. Pin the AutomationIds for buttons we find — Name-based lookup is a starting point, AutomationId is what survives Teams UI updates. Now also includes: validate the audio peak metering against real Teams audio (check that FLTP decoding is correct for whatever sample rate Teams is broadcasting; the `--filter requires=ndi` integration tests don't exercise audio).
 
 2. **Acquire a code-signing cert.** Pipeline is wired (see "CI / Release / Docs" above); just needs `SIGN_CERT_PFX_BASE64` + `SIGN_CERT_PASSWORD` set in Forgejo Secrets. OV cert (~$200/yr) gets us signed but SmartScreen builds reputation slowly; EV cert (~$300/yr, hardware token) is SmartScreen-trusted immediately. Azure Trusted Signing is the cloud-native path if a token-on-runner is fiddly.
 
 3. **Activate `MediaFoundationRecorderSink`.** Scaffold + activation docs at `docs/REAL-TIME-RECORDING.md` ship in this batch (gated behind `MF_AVAILABLE` build symbol). To enable: `dotnet add Vortice.MediaFoundation`, define `MF_AVAILABLE`, swap one line in `IsoController.EnableIsoAsync`. Rough ~10× disk-pressure reduction.
 
-4. **Wire engine audio capture.** The UI's audio level VU bar (in the Live column) is in place but inert — `IsoHealthStats.PeakAudioLevel` always reads 0.0. Engine work needed: extend `INdiInterop.CaptureFrame` to also surface audio frames, parse based on FourCC (FLTp, PCMs16, etc), compute peak per pipeline tick, publish through `IsoPipeline.GetStats`. Once that's done the UI bar starts animating with no further changes.
-
-5. **Forward Teams keyboard shortcuts via SendInput.** Phase E.2 hides the Teams window but doesn't forward Ctrl+Shift+M / Ctrl+Shift+O / Ctrl+Shift+H to it. UIA covers mute/camera/share/leave/raise-hand/chat/background already; SendInput would let us pass arbitrary global hotkeys through to a hidden Teams for actions UIA can't reach. Lower priority now that UIA covers the core actions.
+4. **Forward Teams keyboard shortcuts via SendInput.** Phase E.2 hides the Teams window but doesn't forward Ctrl+Shift+M / Ctrl+Shift+O / Ctrl+Shift+H to it. UIA covers mute/camera/share/leave/raise-hand/chat/background already; SendInput would let us pass arbitrary global hotkeys through to a hidden Teams for actions UIA can't reach. Lower priority now that UIA covers the core actions.