chore(frontend): remove dead boilerplate and unused design assets

[OthmaneZ05]

Summary of Changes

Removes dead frontend assets: the default Vite scaffold files (react.svg, vite.svg), the orphaned hero.png, and two additional unreferenced leftovers found during the sweep — public/icons.svg (a generic social-icon sprite: bluesky/discord/x/github/documentation, never wired into the UI) and public/favicon.svg (an old logo concept that no longer matches the current logo/favicon.png and isn't linked from index.html).

No source vector file for the current logo (src/assets/logo.png) exists anywhere in the repo (no .ai/.fig/.eps/design folder), so no SVG variant was added — flagging this per the task's acceptance criteria instead of guessing at a re-trace.

Types of Changes

• New feature / node type addition
• Bug fix (non-breaking change resolving an issue)
• Refactoring / structural cleanup
• Documentation update

Verification & Testing

Automated Checks

• Run npm run lint successfully with no errors
• Run npm run build successfully with no compilation errors
• Run npm test successfully (all tests pass)

Manual Verification

Confirmed each removed file has zero references across the repo (grep for filename in *.ts/*.tsx/*.js/*.html/*.json/*.css/*.md, excluding node_modules/dist) before deleting. npm run build produces a clean dist/ with no missing-asset warnings; npx vitest run --maxWorkers=1 → 231/231 tests pass across 21 files.

Checklist

• My code follows the repository's code style and lint standards
• I have updated the documentation or instructions if necessary
• All unit and integration tests are passing