Replace status_id with in_progress boolean across mobile apps

- Remove TaskStatus model and status_id foreign key references
- Add in_progress boolean field to task models and forms
- Update TaskApi to use dedicated POST endpoints for task actions:
  - POST /tasks/:id/cancel/ instead of PATCH with is_cancelled
  - POST /tasks/:id/uncancel/
  - POST /tasks/:id/archive/
  - POST /tasks/:id/unarchive/
- Fix iOS TaskViewModel to use error-first pattern for Kotlin-Swift
  generic type bridging issues
- Update iOS callback signatures to pass full TaskResponse instead
  of just taskId to avoid stale closure lookups
- Add in_progress localization strings
- Update widget preview data to use inProgress boolean

🤖 Generated with [Claude Code](https://claude.com/claude-code)

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

iosApp/iosApp/Localizable.xcstrings

@@ -27381,6 +27381,71 @@
         }
       }
     },
+    "tasks_in_progress_label" : {
+      "extractionState" : "manual",
+      "localizations" : {
+        "de" : {
+          "stringUnit" : {
+            "state" : "translated",
+            "value" : "In Bearbeitung"
+          }
+        },
+        "en" : {
+          "stringUnit" : {
+            "state" : "translated",
+            "value" : "In Progress"
+          }
+        },
+        "es" : {
+          "stringUnit" : {
+            "state" : "translated",
+            "value" : "En Progreso"
+          }
+        },
+        "fr" : {
+          "stringUnit" : {
+            "state" : "translated",
+            "value" : "En Cours"
+          }
+        },
+        "it" : {
+          "stringUnit" : {
+            "state" : "translated",
+            "value" : "In corso"
+          }
+        },
+        "ja" : {
+          "stringUnit" : {
+            "state" : "translated",
+            "value" : "進行中"
+          }
+        },
+        "ko" : {
+          "stringUnit" : {
+            "state" : "translated",
+            "value" : "진행 중"
+          }
+        },
+        "nl" : {
+          "stringUnit" : {
+            "state" : "translated",
+            "value" : "In behandeling"
+          }
+        },
+        "pt" : {
+          "stringUnit" : {
+            "state" : "translated",
+            "value" : "Em Andamento"
+          }
+        },
+        "zh" : {
+          "stringUnit" : {
+            "state" : "translated",
+            "value" : "进行中"
+          }
+        }
+      }
+    },
     "tasks_library" : {
       "extractionState" : "manual",
       "localizations" : {