Fix mobile nav scrolling and align CI/workflows with WealthTrack

[cruddasj]

Motivation

• Restore normal vertical scrolling on mobile devices when the navigation menu is open by adjusting the page scroll container behavior.
• Bring repository automation and contributor guidance in line with the tested workflow set used in WealthTrack to improve linting and PR test coverage reporting.

Description

• Change main overscroll handling from overscroll-behavior-y: contain to overscroll-behavior-y: auto in src/styles.css so vertical scrolling works while the mobile nav is open.
• Rebuild the compiled stylesheet with tailwindcss and update the generated assets/styles.css to reflect the fix.
• Replace the workflows under .github/workflows with the WealthTrack set by adding dependabot-changelog.yml, lint.yml, and pr-test.yml, updating static.yml, and removing pr-version.yml.
• Update AGENTS.md to match WealthTrack’s Do/Don't guidance while replacing references to "WealthTrack" with "PWA Template".
• Add changelog placeholders to CHANGELOG.md and assets/changelog.json using [NEXT_VERSION] and [NEXT_DATE] and include brief notes about the scroll fix and workflow updates.

Testing

• Ran npm run build:css to regenerate assets/styles.css and the command completed successfully.
• No additional automated unit or E2E tests were executed in this change; workflow files were added/updated so CI lint and coverage jobs will run on future PRs.

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Codex Task

[github-actions]

Coverage report

St.❔	Category	Percentage	Covered / Total
🔴	Statements	21.42%	175/817
🔴	Branches	27.08%	13/48
🔴	Functions	50%	11/22
🔴	Lines	21.42%	175/817

Test suite run success

1 tests passing in 1 suite.

Report generated by 🧪jest coverage report action from 3ce3ed4