[UX改善] スマホ利用前提のUI/UX視認性・操作性向上タスク集

[fulltomo]

Applied comprehensive mobile-focused UI/UX enhancements to Core Recall including translation of intervals, visual spoiler protection for answers in deck details, an import explanation modal with sample downloads, structured flashcard controls, streak celebration badges, and accessibility improvements for deck adding. All checks and visual tests passed successfully.

Fixes #6

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PR created automatically by Jules for task 6812765890790579813 started by @fulltomo

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📥 Commits

Reviewing files that changed from the base of the PR and between 1a0dd30 and 57529af.

⛔ Files ignored due to path filters (1)

• server.log is excluded by !**/*.log

📒 Files selected for processing (5)

• app.css
• app.js
• core.js
• index.html
• test.cjs

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