feat: add showcase icon hover flicker (closes #2539) and landscape orientation lock (closes #2711)

[rushikeshgarad2024-dev]

Summary of Changes

1. Showcase Icons Hover Flicker (Closes flicker showcased icons on hover [bounty: 8XTR] #2539 — 8 XTR):

   • Added @keyframes showcaseIconFlicker in src/style/styles.less with a ping-pong transition between 25% and 100% opacity over a 1.2s smooth ease-in-out cycle on hover.

2. Landscape Orientation Lock (Closes landscape orintation lock [bounty: 16 XTR] #2711 — 16 XTR):

   • Added automated lockLandscapeOrientation() in src/script.ts utilizing the Screen Orientation API (screen.orientation.lock('landscape')) triggered on DOMContentLoaded and fullscreenchange.

Verification

• Tested CSS keyframe opacity animation with smooth ease-in-out loop.
• Tested Screen Orientation API lock with graceful non-fullscreen error catch.

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