Fix timeline horizontal view UI issues

[yepzdk]

Summary

• Fix legend component include path and add legend data (Timeline: Restore missing legend component #602)
• Today marker only shows as dot on horizontal timeline, not as card (Timeline: Today marker should only show dot, not card #599)
• Reorder horizontal view: timeline dots first, cards second, pager last (Timeline: Pager buttons should be below cards on horizontal view #601)
• Add clickable dots with month/year labels along horizontal timeline (Timeline: Connecting line with dots missing in horizontal view #600)
• Fix card text content layout for proper flex in horizontal view (Timeline: Date/year label in separate column on horizontal cards #604)
• Fix action button alignment with margin-top: auto (Timeline: Action button on cards is misaligned #603)
• Auto-navigate carousel to the latest non-upcoming card on load
• Exclude field_show_timeline and field_timeline from raw content output

Test plan

• Load fixtures with task fixtures:load
• Visit a project page with timeline enabled
• Toggle to horizontal view and verify:
  • Timeline dots appear above the card with month/year labels
  • "I dag" marker shows as hollow orange dot with "I dag" label
  • Carousel starts at the most recent non-upcoming card
  • Clicking dots navigates to corresponding card
  • Pager appears below the card
  • Legend appears at the bottom with correct status colors
• Verify no raw field data appears above the timeline
• Test view toggle works in both directions

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