fix(l10n): low-severity language findings from the usertest panel

- 'Mit Endpunkt verbinden' — no Endpoint/Endpunkt mix
- audit-chain lead term is 'Hash-Kette' everywhere (doctor pill);
  chain detail says 'Verkettung lückenlos geprüft' instead of the
  raw field name prev_event_sha256
- welcome checklist line says who refreshes what
- setup privacy note explains the local model instead of ending in
  a bare model tag
- default project renders localized ('Allgemein') in the switcher;
  sealed-area status pills explain run state on hover

Signed-off-by: flemming-it <stefan.a.flemming@googlemail.com>

lib/l10n/app_localizations_en.dart

@@ -247,7 +247,7 @@ class AppLocalizationsEn extends AppLocalizations {
 
   @override
   String get welcomeChecklistBody =>
-      'Four steps to a working hub. Live state — refresh after changing anything.';
+      'Four steps to a working hub. The list shows the live state — refresh top right after changing anything.';
 
   @override
   String get welcomeChecklistAi => 'Configure System AI';
@@ -2200,7 +2200,7 @@ class AppLocalizationsEn extends AppLocalizations {
       other: 'events',
       one: 'event',
     );
-    return '$n $_temp0 · prev_event_sha256 verified end-to-end';
+    return '$n $_temp0 · linkage verified end-to-end';
   }
 
   @override
@@ -2212,7 +2212,7 @@ class AppLocalizationsEn extends AppLocalizations {
   }
 
   @override
-  String get doctorChainPillOk => 'Integrity chain verified';
+  String get doctorChainPillOk => 'Hash chain verified';
 
   @override
   String get doctorChainPillTamper => 'TAMPER';
@@ -3126,6 +3126,9 @@ class AppLocalizationsEn extends AppLocalizations {
   @override
   String get workspaceAll => 'All projects';
 
+  @override
+  String get workspaceDefaultProject => 'General';
+
   @override
   String get workspaceSwitcherTooltip =>
       'Workspace — filters this view and stamps new runs with the selected project';
@@ -3201,6 +3204,14 @@ class AppLocalizationsEn extends AppLocalizations {
   @override
   String get workspaceSealedStopped => 'stopped';
 
+  @override
+  String get workspaceSealedRunningHint =>
+      'The sealed area runs as its own hub process. Selecting it switches in.';
+
+  @override
+  String get workspaceSealedStoppedHint =>
+      'The sealed area is not running right now. Selecting it starts it and switches in.';
+
   @override
   String workspaceSealedStarting(String name) {
     return 'Starting sealed area “$name”…';
@@ -3492,7 +3503,7 @@ class AppLocalizationsEn extends AppLocalizations {
 
   @override
   String setupFreeTextPrivacyLocal(String model) {
-    return 'Your description is processed locally on this machine ($model).';
+    return 'Your description is processed right on this machine — by the local AI model $model. Nothing leaves the device.';
   }
 
   @override