fix(tui): count all processes in status bar, not just running ones

The tree now shows all processes regardless of state, so the status bar
count should match by counting all Process activities.

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

Author: domenkozar

devenv-tui/src/model.rs

@@ -1184,11 +1184,8 @@ impl ActivityModel {
                         summary.failed_tasks += 1
                     }
                 },
-                (ActivityVariant::Process(proc), NixActivityState::Active) => {
-                    if proc.status == ProcessStatus::Running || proc.status == ProcessStatus::Ready
-                    {
-                        summary.running_processes += 1;
-                    }
+                (ActivityVariant::Process(_), _) => {
+                    summary.running_processes += 1;
                 }
                 _ => {}
             }