Update tasks doc and fix Robot test keyword

- Remove completed Task 1 from Docs/tasks.md
- Fix download.robot: use Get JSON Value instead of deprecated Get Value From Json
- Minor whitespace cleanup

tests/robot/api/download.robot

@@ -98,7 +98,7 @@ Remove Item From Queue
     ...    priority=NORMAL
     ${add_resp}=    Add To Queue    ${payload}
     ${json}=    Convert String To Json    ${add_resp.text}
-    ${ids}=    Get Value From Json    ${json}    $.item_ids
+    ${ids}=    Get JSON Value    ${add_resp}    $.item_ids
     ${item_id}=    Get From List    ${ids}    0
     ${del_resp}=    DELETE API    /api/queue/item/${item_id}
     Response Should Have Status    ${del_resp}    200
@@ -114,7 +114,7 @@ Retry Failed Item
     ...    priority=NORMAL
     ${add_resp}=    Add To Queue    ${payload}
     ${json}=    Convert String To Json    ${add_resp.text}
-    ${ids}=    Get Value From Json    ${json}    $.item_ids
+    ${ids}=    Get JSON Value    ${add_resp}    $.item_ids
     ${item_id}=    Get From List    ${ids}    0
     # Retry endpoint accepts item_ids list, returns 200 even if no items actually failed
     # (retried_count will be 0 if item wasn't in failed state)