fix(ypp): refresh 403'd on every real call — drop the auditDetails part (needs a partner scope)

Creator: 'when I attempt to refresh my YPP page, I get an error about not being
able to reach YouTube. Seriously?' Real log: channels.list failed (403) x3.

Root cause #1 (the 403): channels.list?mine=true&part=statistics,auditDetails,
contentDetails returns 403 insufficientPermissions when the token lacks the
youtubepartner-channel-audit scope — which the auditDetails part ALONE requires,
per the docs ('A request that retrieves the auditDetails part ... must provide an
authorization token that contains the youtubepartner-channel-audit scope'). That
scope is MCN partner tooling with a 2-week token-revocation rule; the app must not
hold it. TASK-39's 'current scopes suffice, no re-consent' slice-1 claim was wrong
for this part; mock-fake tests never touched the real API, so it shipped green and
403'd every refresh since 2026-09-22.
https://developers.google.com/youtube/v3/docs/channels/list

Fix: part=statistics,contentDetails only; standing flags removed from
ChannelStatsService -> YppStatSnapshot surface -> YppTrackerViewModel -> drawer,
replaced by an honest deep-link row ('Channel standing isn't exposed to YouTube
apps — check the Earn page'). YppSnapshot standing columns stay (schema-stable,
always false). channels.list failures now log the response BODY — the bare code
could not name insufficientPermissions, which is what made this undiagnosable.

Root cause #2 (found by the new Good Dog, masked by the 403): statistics come back
as JSON STRINGS ('350'); raw GetInt64() throws. Tolerant ReadInt64 (ValueKind-first;
JsonElement.TryGetInt64 THROWS on strings — type-in, not try-type).

Good Dog: ChannelStatsServiceTests.CaptureCurrent_RequestsNoAuditDetails_AndStillParsesTheSnapshot
(URL asserts no auditDetails + snapshot parses); YppPullOutTests fixture updated.
Recipes for both 403/scope and statistics-strings entered in MyMistakes.md.

Also shipped in the same commit (shared PreviewPane.xaml + ai.md): the audio-sync
status dot removal from the #77 feedback round (creator: 'what is the point of the
status light? Lose it') — IntToSyncBrushConverter deleted with it.

verify.sh gate: 0 warnings, 316/316 pass, scope-check clean.

ytLive.Tests/YppPullOutTests.cs

@@ -61,10 +61,6 @@ public sealed class YppPullOutTests
                 VideoCount = 42,
                 TotalViews = 12_345,
                 UploadsLast90Days = 2,
-                CommunityGuidelinesGoodStanding = true,
-                CopyrightStrikesGoodStanding = true,
-                ContentIdClaimsGoodStanding = true,
-                OverallGoodStanding = true,
             };
 
             var vm = new YppTrackerViewModel(
@@ -81,7 +77,6 @@ public sealed class YppPullOutTests
             Assert.True(vm.HasSnapshot);
             Assert.Equal(350, vm.SubscriberCount);
             Assert.Equal(2, vm.UploadsLast90Days);
-            Assert.True(vm.OverallGoodStanding);
             Assert.Equal("Test Channel", vm.DisplayName);
             Assert.Equal("350 / 500", vm.Tier1SubsText);
             Assert.Equal("350 / 1,000", vm.Tier2SubsText);