fix(01-foundation): revise plans based on checker feedback

- 01-04: wave 3 → 4 (01-03 is also wave 3; parallel executor would race)
- 01-06: wave 4 → 5 (cascades from 01-04 fix); add FeatureTabBase UserControl
  for per-tab progress/cancel strip; bind StatusBar middle item to ProgressStatus
  instead of ConnectionStatus per locked CONTEXT.md decision
- 01-07: wave 5 → 6 (cascades)
- 01-08: wave 6 → 7 (cascades)

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

.planning/phases/01-foundation/01-07-PLAN.md

@@ -2,7 +2,7 @@
 phase: 01-foundation
 plan: 07
 type: execute
-wave: 5
+wave: 6
 depends_on:
   - 01-06
 files_modified:
@@ -242,7 +242,7 @@ public class SettingsViewModel : FeatureViewModelBase
     ```csharp
     SettingsTabItem.Content = serviceProvider.GetRequiredService<SettingsView>();
     ```
-    Add `x:Name="SettingsTabItem"` to the Settings TabItem in XAML.
+    The Settings TabItem already has `x:Name="SettingsTabItem"` from plan 01-06.
 
     Run `dotnet build` and fix any errors.
   </action>