Rebrand public app to “Pinboard”

[Dereje1]

Motivation

• Remove public-facing references to Pinterest/Pinterest Clone and present a neutral, original app identity while keeping the existing production hostname and infrastructure unchanged (pclone.derejegetahun.com).
• Keep this change narrowly scoped to UI/metadata/asset branding so authentication, storage, database schemas, and deployment routing are unaffected.

Description

• Update browser title, description, and Open Graph metadata to use Pinboard in client/index.html.
• Replace landing/cover text and icon in client/src/components/cover/cover.tsx and update the header/navbar brand in client/src/components/menu/menu.tsx to Pinboard and a neutral grid icon.
• Replace the Pinterest-branded favicon.ico with a neutral client/public/favicon.svg and remove the old favicon asset.
• Update public README display name to Pinboard and refresh Jest snapshots for the affected UI tests to reflect the branding changes; no server, auth, DB, S3, routing, or infrastructure files were modified. Closes Rebrand the public app without changing the existing pclone domain or infrastructure #61.

Testing

• Ran npm run compileTS and it passed.
• Ran npm run lint and it passed.
• Ran the full test suite with npm test -- --watch=false --runInBand and all tests passed (42 test suites, 308 tests in this environment).
• Built the server and client with npm run build_server and npm run build_client, and both builds completed successfully.

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Codex Task

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 98.61%. Comparing base (7e1baf2) to head (299ffd5).
⚠️ Report is 5 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master      #62   +/-   ##
=======================================
  Coverage   98.61%   98.61%           
=======================================
  Files          50       50           
  Lines        1805     1805           
  Branches      312      312           
=======================================
  Hits         1780     1780           
  Misses         24       24           
  Partials        1        1           

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