Feat/cherry blossom reduced motion

[aisshwaryaa8-collab]

Description

CherryBlossom renders 25 falling petals on an infinite (repeat: Infinity) loop across the full viewport, with no way for the user to opt out. This adds a check using framer-motion's useReducedMotion() hook — if the user has prefers-reduced-motion: reduce set at the OS level, the component now returns null instead of forcing the animation on them. This aligns with WCAG 2.3.3 guidance on perpetual background motion.
Also updated the existing framer-motion mocks across 7 other CherryBlossom.*.test.tsx files to include useReducedMotion, since they previously only mocked motion.div and broke once the component started calling the new hook. Added 2 new tests to CherryBlossom.test.tsx covering both the reduced-motion and normal-motion paths.

Fixes #6139 6139

Pillar

• 🎨 Pillar 1 — New Theme Design
• 📐 Pillar 2 — Geometric SVG Improvement
• 🕐 Pillar 3 — Timezone Logic Optimization
• 🛠️ Other (Bug fix, refactoring, docs)

Visual Preview

None

Checklist before requesting a review:

• I have read the CONTRIBUTING.md file.
• I have tested these changes locally (localhost:3000/api/streak?user=YOUR_USERNAME).
• I have run npm run format and npm run lint locally and resolved all errors (CI will fail otherwise).
• My commits follow the Conventional Commits format (e.g., feat(themes): ..., fix(calculate): ...).
• I have updated README.md if I added a new theme or URL parameter.
• I have started the repo.
• I have made sure that i have only one commit to merge in this PR.
• The SVG output matches the CommitPulse "premium quality" aesthetic standard (no raw elements, smooth animations, correct fonts).
• (Recommended) I joined the CommitPulse Discord community for contributor discussions, mentorship, and faster PR support.

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👋 Hey @aisshwaryaa8-collab! Thanks for your interest in contributing to CommitPulse! 🙏

Unfortunately, this PR has been automatically closed because you are not assigned to the linked issue #6139 — feat: Respect prefers-reduced-motion for CherryBlossom background animation.

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