Test/resume parser responsive breakpoints (JhaSourav07#3312)

## Description

Fixes JhaSourav07#2879 

This PR adds responsive breakpoint validation tests for the resume
parser module. It ensures correct layout behavior across mobile viewport
widths (specifically 375px), validating column reflow, overflow safety,
navigation scaling, and mobile toggle interactions.

## Pillar
* [ ] 🎨 Pillar 1 — New Theme Design
* [x] 📐 Pillar 2 — Geometric SVG Improvement *(closest fit: responsive
layout behavior tests)*
* [ ] 🕐 Pillar 3 — Timezone Logic Optimization
* [x] 🛠️ Other (Bug fix, refactoring, docs)

## Visual Preview
Not applicable (unit test only — no UI change)

## Checklist before requesting a review:
* [x] I have read the `CONTRIBUTING.md` file.
* [x] I have tested these changes locally (`vitest run
lib/resume-parser.responsive-breakpoints.test.ts`).
* [x] I have run `npm run format` and `npm run lint` locally and
resolved all errors (CI will fail otherwise).
* [x] My commits follow the Conventional Commits format (e.g.,
`feat(themes): ...`, `fix(calculate): ...`).
* [ ] I have updated `README.md` if I added a new theme or URL
parameter. *(not needed)*
* [x] I have started the repo.
* [x] I have made sure that I have only one commit to merge in this PR.
* [x] The SVG output matches the CommitPulse "premium quality" aesthetic
standard (no raw elements, smooth animations, correct fonts). *(not
applicable)*
* [ ] (Recommended) I joined the CommitPulse Discord community for
contributor discussions, mentorship, and faster PR support.

Author: JhaSourav07