feat: add sortable column headers to all job list tables

[vishaltps]

Summary

• Add clickable column header sorting to all job list tables
• Click to sort ascending, click again to toggle descending
• Visual indicators: ↑ (ascending), ↓ (descending), ⇅ (sortable/default)
• Sort state preserved across pagination and filtering

Tables with Sorting

Table	Sortable Columns	Default Sort
Ready Jobs	class_name, queue_name, priority, created_at	created_at DESC
Scheduled Jobs	class_name, queue_name, scheduled_at	scheduled_at ASC
Failed Jobs	class_name, queue_name, created_at	created_at DESC
In Progress Jobs	class_name, queue_name, created_at	created_at DESC
Recurring Jobs	key, class_name, queue_name, priority	key ASC
Jobs	class_name, queue_name, status, created_at	created_at DESC
Queues	queue_name, job_count	job_count DESC
Workers	hostname, last_heartbeat_at	last_heartbeat_at DESC

Implementation

• Added sort infrastructure to BaseController with sort_params, apply_sorting, and apply_execution_sorting methods
• Added sortable_header helper to BasePresenter for generating clickable header links
• Added CSS styles for sortable headers with hover and active states
• Special handling for execution tables that require JOINs on the jobs table
• Special handling for GROUP BY queries on the queues page

Test Plan

• All 181 tests pass (5 pre-existing pending)
• Manual testing completed on all pages
• Rubocop passes with no offenses