fix: address post-event-driven issues and client info parity (#16)

* fix(ui): restore speaking status indicators

Speaking state (isSpeaking) is computed from voice activity timestamps
in the protocol layer and cannot be represented as a discrete delta.
The event-driven refactor removed periodic snapshot refreshes, causing
speaking indicators to go stale.

Adds a 750ms periodic snapshot refresh (matching SPEAKING_ACTIVITY_WINDOW)
while the audio stats timer is active (in-channel only). Structural
changes (moves, joins, leaves) are still handled by instant deltas.

* fix(ui): hide server query clients from delta joins

When a ServerQuery client sends a message, a ClientJoined delta fires.
Before PR#15 the periodic snapshot rebuild would include the SQ client
but the snapshot_view filter hid it. With deltas, the client persisted
in the local snapshot. Now ClientJoined deltas skip SQ clients entirely.

* fix(proto): log getconnectioninfo errors instead of silently discarding

Ping and packet loss showing 'Unknown' in the client info sheet is
caused by getconnectioninfo failures being silently swallowed. Now
logs the error with the client_id so the root cause can be diagnosed
(e.g. missing b_client_connectioninfo_view permission on the server).

Also logs clientgetvariables failures.

* fix(proto): refresh non-self client profiles before mapping

* feat(protocol): add ping deviation to client profiles

* chore(ui): regenerate Flutter bridge bindings for ping deviation

* fix(l10n): add ping deviation labels to client info

* feat(ui): show ping deviation in client info sheet

apps/chanora_flutter/lib/l10n/generated/app_localizations.dart

@@ -1069,6 +1069,12 @@ abstract class AppL10n {
   /// **'Ping'**
   String get clientInfoPing;
 
+  /// No description provided for @clientInfoPingDeviation.
+  ///
+  /// In en, this message translates to:
+  /// **'Ping deviation'**
+  String get clientInfoPingDeviation;
+
   /// No description provided for @clientInfoAddress.
   ///
   /// In en, this message translates to:

apps/chanora_flutter/lib/l10n/generated/app_localizations_en.dart

@@ -543,6 +543,9 @@ class AppL10nEn extends AppL10n {
   @override
   String get clientInfoPing => 'Ping';
 
+  @override
+  String get clientInfoPingDeviation => 'Ping deviation';
+
   @override
   String get clientInfoAddress => 'Address';
 

apps/chanora_flutter/lib/l10n/generated/app_localizations_zh.dart

@@ -531,6 +531,9 @@ class AppL10nZh extends AppL10n {
   @override
   String get clientInfoPing => '延迟';
 
+  @override
+  String get clientInfoPingDeviation => '延迟偏差';
+
   @override
   String get clientInfoAddress => '地址';