fix: polish countdown UI and light-mode share button

[hoangsvit]

Summary

• prevent countdown deadline text from being truncated on desktop
• allow long deadline date/time strings to wrap instead of showing an ellipsis
• fix the Share button light-mode selector to match the app's class-based theme setup
• improve Share button contrast in light mode, including hover, focus, success, and error states

Causes

1. Countdown deadline text used white-space: nowrap, overflow: hidden, and text-overflow: ellipsis, so narrow desktop heading columns clipped the date/time.
2. The Share button light styles targeted html[data-theme="light"], while the app's ThemeProvider uses attribute="class". As a result, the light override never applied and the dark-theme button colors were shown on a light background.

Changes

• let .program-countdown-heading span wrap normally
• switch the Share button light selector to html.light
• use stronger light-mode blue contrast and add matching light success/error states

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[github-actions]

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[coderabbitai]

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