feat: add calendar screen#243

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kevinlee-06 wants to merge 3 commits intofeat/calendar-repositoryfrom

feat/calendar-screen

Commits on Mar 27, 2026

feat: Add calendar screen, integrating `table_calendar`, portal events, and i18n strings.
kevinlee-06
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refactor: Improve mock event date readability and correctly interpret NTUT API epoch timestamps by accounting for UTC+8.
kevinlee-06
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refactor: manage calendar selected day state with Riverpod and optimize event display and range updates.
kevinlee-06
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