feat(web): add Valentines Day theme to homepage

[roomote]

Add a festive Valentines Day theme to the marketing homepage that automatically activates from February 1-15.

Features

• Animated banner with hearts at the top of the page
• Floating hearts background animation
• Themed heading with gradient text and animated heart icon
• Rose-colored background glow in the hero section
• Valentine-specific messaging that encourages users to "fall in love with coding again"

Implementation

• New components: ValentinesBanner and FloatingHearts
• CSS animations: heartbeat and float-up
• Date-based activation logic (Feb 1-15)
• All elements gracefully fall back to the standard theme outside the date range

---

Important

Adds Valentine's Day theme to homepage with animations and components active Feb 1-15.

• Behavior:
  • Adds Valentine's Day theme to homepage, active Feb 1-15.
  • Includes animated banner, floating hearts, themed heading, and rose-colored glow.
  • Valentine-specific messaging in hero section.
• Components:
  • New ValentinesBanner and FloatingHearts components in homepage.
  • isValentinesSeason() function in page.tsx to check date range.
• CSS:
  • Adds heartbeat and float-up animations in globals.css.
  • Applies animations to relevant elements in page.tsx and valentines-banner.tsx.

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[roomote]

Rooviewer   See task on Roo Cloud

Review complete. No new issues found in the latest changes. 2 previously flagged issues remain unresolved:

• ValentinesBanner flash/layout shift - Initializing isVisible to true causes the banner to flash and disappear outside Valentine's season
• Server/client date inconsistency - Cached server-side date check can mismatch with real-time client checks at date boundaries

Previous reviews

• 76a13a1: Review #1

_{Mention @roomote in a comment to request specific changes to this pull request or fix all unresolved issues.}

[github-actions]

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[roomote]

Initializing isVisible to true causes the banner to render on the server and during initial hydration. Outside Valentine's season (before Feb 1 or after Feb 15), the banner will flash briefly then disappear when the useEffect runs, causing both a visual flash and a layout shift as content below moves up. Consider initializing to false so the banner only appears after the date check confirms it's Valentine's season.

Suggested change

	const [isVisible, setIsVisible] = useState(true)
	const [isVisible, setIsVisible] = useState(false)

_{Fix it with Roo Code or mention @roomote and request a fix.}

[roomote]

The server-side isValentinesSeason() check is cached for up to 1 hour (revalidate = 3600), while client components (ValentinesBanner, FloatingHearts) independently check the date in real-time via useEffect. At date boundaries (Jan 31 -> Feb 1 or Feb 15 -> Feb 16), this can cause visual inconsistency where the background glow color (server-determined) doesn't match the banner/hearts visibility (client-determined). Consider passing the server-calculated isValentines value as a prop to client components, or accept this as an acceptable edge case at date boundaries.

_{Fix it with Roo Code or mention @roomote and request a fix.}