chore: remove committed .idea directory and fix .gitignore

[JWhite212]

Summary\n\n- Fix .gitignore: the existing file listed specific .idea/ sub-paths (modules.xml, jarRepositories.xml, etc.) but not the directory itself, so IntelliJ still committed .idea/.gitignore, .idea/encodings.xml, and .idea/misc.xml. Replaced the partial entries with a single .idea/ pattern that covers the whole directory.\n- Remove committed .idea/ files: deletes the three tracked IDE artefacts that slipped past the incomplete ignore rules.\n\n## Why this matters\n\nCommitted IDE configuration files add noise to the repository, can expose developer machine paths, and signal to employers that basic git hygiene was not applied. The fix prevents any future .idea/ files from being committed and removes the existing ones from the working tree.\n\n## Note on git history\n\nThis PR removes the files from the branch tip (they will not appear in a git clone), but they remain in the commit history. To scrub them entirely, run git filter-repo --path .idea/ --invert-paths locally — optional for a portfolio repository.\n\n## Test plan\n\n- [ ] Confirm .idea/ no longer appears in the repository file tree after merge\n- [ ] Confirm .gitignore now includes .idea/ as a whole-directory pattern

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