Redesign smart capture settings panel UX

[itsDNNS]

Summary

• Merge master toggle into trigger card header -- panel dims via CSS :has() when SC is off
• Replace all inline styles in trigger cards with proper CSS classes (sc-trigger-header, sc-trigger-label, sc-trigger-icon, sc-trigger-name, sc-trigger-desc)
• Active triggers get highlighted background + amethyst border, icons transition from muted to accent
• Sub-settings expand/collapse via grid-template-rows transition (removed initSmartCaptureToggles JS entirely)
• Add loading spinner to execution history, error toast on fetch failure
• Normalize warning banner from custom inline-styled card to .module-restart-banner
• Add human-readable guardrails summary ("At most 4/hour, minimum 5 min apart") that updates live on input
• i18n: 2 new keys per language (EN/DE/FR/ES), all validated in sync

Test plan

• Open Settings > Smart Capture, verify master toggle is in the card header
• Toggle SC off, verify triggers + guardrails + history dim and become non-interactive
• Toggle SC on, verify content becomes interactive with smooth opacity transition
• Enable a trigger, verify card highlights (background tint + accent border) and icon color changes
• Enable a trigger with sub-settings (e.g. Modulation), verify smooth expand animation
• Disable the trigger, verify smooth collapse
• Check guardrails summary shows computed values, change inputs and verify it updates live
• Navigate to Smart Capture, verify history loading spinner appears then resolves
• If no Speedtest Tracker configured, verify amber warning banner matches module-restart-banner style
• Switch language to DE/FR/ES, verify all strings translated