Feature: Activity Heatmap Export Implementation

[armanpanigrahi59]

Description

Fixes #5090

Pillar

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

Visual Preview

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.

[vercel]

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[retenta-bot]

This PR introduces the export feature for the activity heatmap, which is a significant enhancement for user interaction. It aligns with our previous decisions, such as the addition of a dark/light preview background toggle to improve user experience. Please ensure that the SVG output meets the premium quality standards we established. Looking forward to your feedback!

[github-actions]

📦 Next.js Bundle Size Report (Gzipped Sizes)

Asset	PR Size	Base Size	Difference	Status
static/chunks/2759-[hash].js	165.05 KB	165.03 KB	+0.03 KB (+0.02%)	🔴 Regression
static/chunks/4806-[hash].js	-	11.05 KB	-11.05 KB (-100.00%)	🗑️ Deleted
static/chunks/5873-[hash].js	3.27 KB	-	+3.27 KB (++100%)	🆕 New
static/chunks/691-[hash].js	-	3.31 KB	-3.31 KB (-100.00%)	🗑️ Deleted
static/chunks/7296-[hash].js	18.28 KB	17.19 KB	+1.10 KB (+6.39%)	🔴 Regression
static/chunks/9250-[hash].js	11.23 KB	-	+11.23 KB (++100%)	🆕 New
static/chunks/app/(root)/dashboard/[username]/page-[hash].js	57.86 KB	57.13 KB	+0.74 KB (+1.29%)	🔴 Regression
static/chunks/app/api/tech-stack/route-[hash].js	0.27 KB	-	+0.27 KB (++100%)	🆕 New
static/chunks/main-[hash].js	41.25 KB	41.23 KB	+0.02 KB (+0.05%)	🔴 Regression

📊 Summary of Totals

Category	PR Size	Base Size	Difference
Total JS	4948.73 KB	4939.27 KB	+9.46 KB (+0.19%)
Total CSS	348.53 KB	348.46 KB	+0.07 KB (+0.02%)

[Aamod007]

Thank you for implementing the Activity Heatmap export functionality! Providing users with PNG, PDF, and SVG export options in \components/dashboard/ActivityHeatmapPro.tsx\ and \Heatmap.tsx\ is a fantastic addition. The UI looks solid with the dropdowns and Sonner toasts. I do notice it also includes API changes for a \ echstack\ route and MongoDB caching. Please ensure these bundled changes are intentional in the future, as isolated PRs are easier to review. The export implementation itself looks solid, great work!