refactor: extract queue-scoped jobs view to Queues::JobsController

[eclectic-coding]

Summary

• JobsController#index now owns only status filtering — the ?queue= param and @queue instance variable are gone
• New nested resource Queues::JobsController at /jobs/queues/:queue_name/list handles all queue-scoped job listing, individual discard (with Turbo Stream), and bulk discard — each redirecting back within the queue context
• Queue name links in the global jobs list navigate to the nested view instead of appending ?queue=
• JobsController simplified: set_status_and_queue → set_status, filtered_scope no longer conditionally scopes by queue

Routes added

GET  /jobs/queues/:queue_name/list              queues/jobs#index
DEL  /jobs/queues/:queue_name/list/:id          queues/jobs#destroy
POST /jobs/queues/:queue_name/list/discard_all  queues/jobs#discard_all

Test plan

• 86 examples, 100% line coverage (bundle exec rspec)
• RuboCop clean (bin/rubocop)
• Manual: click a queue name from the jobs list → lands on the queue-scoped view with breadcrumb
• Manual: status tabs, search, and discard all stay within the queue context
• Manual: Turbo Stream row removal and empty-state swap work on the queue view

🤖 Generated with Claude Code

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 100.00%. Comparing base (35e7130) to head (d883386).
⚠️ Report is 5 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff            @@
##              main       #18   +/-   ##
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  Coverage   100.00%   100.00%           
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  Files           11        12    +1     
  Lines          153       187   +34     
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+ Hits           153       187   +34     

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