docs(customization): Add documentation for view=punchcard feature

[ChetanSenta]

Description

Fixes #8953

Pillar

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

What this PR does

view=punchcard — a fully wired-up, dedicated isometric 24×7 commit-
timing chart with its own GitHub data fetch (fetchCommitPunchCard) —
had zero mentions anywhere in docs/customization.md. Added it to both
view table rows, an example, and a guard test asserting every real
view enum value gets a documentation mention going forward.

Checklist before requesting a review:

• I have read the CONTRIBUTING.md file.
• I have tested these changes locally.
• I have run npm run format and npm run lint locally and resolved all errors.
• My commits follow the Conventional Commits format.
• I have made sure that I have only one commit to merge in this PR.

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[retenta-bot]

This PR addresses the lack of documentation for the view=punchcard feature by adding necessary details to the customization documentation. It's great to see this improvement, especially since it ensures that all view enum values are documented going forward. This aligns well with previous decisions to enhance visualizations like the Punch Card Heatmap, which also aimed to provide better insights into commit activity. Thank you for your contribution!

[github-actions]

📦 Next.js Bundle Size Report (Gzipped Sizes)

✨ No significant bundle size changes detected.

📊 Summary of Totals

Category	PR Size	Base Size	Difference
Total JS	4998.89 KB	4998.89 KB	0 B
Total CSS	354.18 KB	354.18 KB	0 B

[Aamod007]

Thanks for documenting the new \�iew=punchcard\ feature! Keeping our customization parameter reference up-to-date is extremely helpful for our users. Approved!