fix(project view): load nested README paths

Yarra Vivekrequested to merge
vivekyarra567/cli:fix/project-view-nested-readme into main

Summary

Split the README URL into only the ref and remaining repository path, preserving nested paths such as docs/README.md. Malformed README URLs now return an error instead of risking an out-of-range panic.

Tests

  • go test ./internal/commands/project/view -run TestProjectView
  • git diff --check

Closes #8458 (closed)

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