🎨 Palette: [UX improvement] Add missing focus states to calendar buttons

[seonghobae]

💡 What: Added missing focus-visible styles to calendar action buttons (CalendarSidebarRight and CalendarWritebackSection).
🎯 Why: Improves keyboard accessibility by providing a clear visual indicator when the button is focused.
📸 Before/After: Interactive buttons previously lacked a focus ring; now they have a clear outline when focused via keyboard navigation.
♿ Accessibility: Ensures keyboard users can easily see which element has focus.

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PR created automatically by Jules for task 2665236050190142270 started by @seonghobae

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[opencode-agent]

OpenCode Review Overview

• Head SHA: 7704c52603c76eab2dc55aa97337959b17e71b62
• Workflow run: 28742973932
• Workflow attempt: 1
• Gate result: APPROVE (exit 0)

Changed-File Evidence Map

flowchart LR
  PR["PR changed files"] --> Evidence["OpenCode bounded evidence"]
  Evidence --> S1["Frontend (2 files)"]
  S1 --> I1["browser runtime and bundle"]
  I1 --> R1["Review risk: Frontend (2 files)"]
  R1 --> V1["frontend tests"]

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