feat: display analysis queue position while waiting for results

[vvatelot]

Summary

• Show the analysis queue position under the popup loader while polling the task endpoint.
• Surface queue_position (people ahead / next in line / currently running) and tasks_in_progress so users know when their turn is coming.
• Parse 425 responses immediately so the queue status updates before the next retry.

Test plan

• Launch an analysis from the popup while other tasks are queued and confirm the loader shows how many analyses are ahead.
• Confirm the message switches to “next in the queue” when queue_position is 0.
• Confirm the message switches to “it’s your turn” when queue_position becomes null (task running).
• Confirm the in-progress count appears when tasks_in_progress > 0.
• Confirm the popup still shows the result (or error) when the task completes.

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