Add step sequence widget

[Copilot]

Homey compose projects manage translations in /.homeycompose/locales, not /locales. The widget also needs to follow the standardized basic-widget CSS pattern used by Timer and other widgets.

Changes

Locale management

• Moved translations from /locales/*.json → /.homeycompose/locales/*.json (13 languages)

Widget standardization

• Changed HTML structure from custom .step-sequence classes to .basic-widget pattern:

  <!-- Before: Custom layout -->
  <div class="step-sequence">
    <div class="step-sequence-caption">...</div>
    <div class="step-sequence-step">...</div>
  </div>
  
  <!-- After: Standard basic-widget pattern -->
  <div class="basic-widget">
    <div class="basic-widget-caption">
      <div class="basic-widget-header">...</div>
      <div class="basic-widget-content">...</div>
    </div>
  </div>

• Simplified CSS from custom styles to base imports only
• Removed icon elements (cycles lack color/icon properties unlike timers/labels)

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