Project covers, real profile photo, and About/contact fixes

[AltanEsmer]

Summary

Replaces placeholder boxes with real imagery and bundles four follow-up fixes from the same pass.

Project preview covers

• Add a cover? field to the Frontmatter type and render it on case-study pages (/projects/[slug]), falling back to the old "Project preview" placeholder when unset.
• Generate 5 self-contained, on-brand SVG covers (editorial palette, per-project line-art motif) under public/projects/ and wire each into its MDX frontmatter — one commit per project.

Real profile photo

• Add public/altan-esmer.jpg and replace the "AE" initials badge in the homepage hero and the "Portrait" placeholder on the About page with the photo (object-fit: cover).

About & contact fixes

• Remove LinkedIn links from the footer and contact card (no account).
• Contact form now actually sends: on submit it builds a mailto:esmeraltan@gmail.com URL (subject + name/email/budget/message body) and opens the visitor's mail client — static-export safe, no backend. Success copy updated to reflect reality.
• Timeline reversed to ascending and years corrected: started university 2023, B.Sc. graduation 2026.
• Fixed the misaligned timeline rule: the blue dots now sit centered on the vertical line (was left: -7, off-center; now -11, verified dot center == line center).

Verification

• npm run lint and npm run build (static export) both pass.
• Verified in the dev server: covers render on case-study pages; hero + About photo render correctly (not stretched); timeline reads 2023→2026 with centered dots; LinkedIn gone site-wide; contact submit produces a correctly-encoded mailto and shows the success state. No console errors.

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