IconComponent & Dashboard Turbo Stream Granularity

What Was Built

• IconComponent with 5 named icons (menu_dots, refresh, chevron_down, external_link, spinner), 3 size variants (sm/md/lg), and css_class override support
• Replaced all inline SVGs in _row.html.erb, _details.html.erb, _health_status_badge.html.erb with IconComponent renders
• Delegated loading_spinner_svg and external_link_icon helpers to IconComponent
• Dashboard stat cards now have per-stat unique IDs (source_monitor_stat_{key})
• TurboBroadcaster sends 5 individual stat card replacements instead of one full _stats partial broadcast

Commits

• caa4e69 feat(05-04): add IconComponent with named icon registry
• 4c56789 refactor(05-04): replace inline SVGs with IconComponent
• 35cd427 feat(05-04): split dashboard stats into per-stat Turbo Streams
• 3e315d9 test(05-04): add tests for granular dashboard stat broadcasting
• 35b3560 style(05-04): fix RuboCop array bracket spacing in IconComponent

Tasks Completed

• Task 1: IconComponent with test suite (13 tests, 18 assertions)
• Task 2: Inline SVG replacement in 4 files (0 inline SVGs remaining in modified views)
• Task 3: Per-stat Turbo Stream broadcasting with STAT_CARDS constant
• Task 4: Dashboard broadcaster tests (5 new tests for granular updates)
• Task 5: Full verification (1551 tests pass, 0 RuboCop offenses)

Files Modified

• app/components/source_monitor/icon_component.rb -- new IconComponent
• test/components/source_monitor/icon_component_test.rb -- IconComponent tests
• app/views/source_monitor/sources/_row.html.erb -- menu_dots SVG replaced
• app/views/source_monitor/sources/_details.html.erb -- refresh SVG replaced
• app/views/source_monitor/sources/_health_status_badge.html.erb -- chevron_down SVG replaced
• app/helpers/source_monitor/application_helper.rb -- loading_spinner_svg and external_link_icon delegate to IconComponent
• app/views/source_monitor/dashboard/_stats.html.erb -- individual stat card renders with key
• app/views/source_monitor/dashboard/_stat_card.html.erb -- unique ID per stat card
• lib/source_monitor/dashboard/turbo_broadcaster.rb -- per-stat broadcast with STAT_CARDS
• test/lib/source_monitor/dashboard/turbo_broadcaster_test.rb -- 5 new granular broadcast tests

Deviations

• DEVN-01: Added size: nil support to IconComponent so loading_spinner_svg and external_link_icon callers can provide full css_class without conflicting size classes. Minor addition, no scope change.