feat(onboarding): add launch at login step and make start/help targets

[guicheffer]

Summary

Adds a new onboarding step (step 7 of 9) that asks the user whether to launch Vox at login. Also adds make start as an alias for make dev and a make help target listing all available targets.

Changes

• New LaunchAtLoginStep component (step 7 of 9) — radio choice defaulting to current config value (launchAtLogin), which now defaults to false instead of isProduction
• launchAtLogin default changed from isProduction to false in createDefaultConfig(); the actual OS call in ipc.ts is already guarded by app.isPackaged, so there is no dev-environment impact
• All 10 locale files updated with translated keys for the new step (onboarding.launchAtLogin.*)
• Step totals updated from 8→9 across all existing onboarding step components
• OnboardingOverlay step map, nav guard, and analytics step index updated accordingly
• OnboardingStep type and MAX_STEP constant extended to include step 8
• make start added as alias for make dev; make help added listing all targets
• CONTRIBUTING.md and README.md updated with new make targets

Test plan

• npm run typecheck passes
• npm run lint passes
• npm test passes
• New step render test (renders launch at login step at step 7)
• Dots count updated to >= 9
• Analytics step updated to completed_step: 8
• Config default test (launchAtLogin defaults to false)
• Pre-existing done step test updated to step 8
• Launch at login step reflects current config value (radio pre-selected when launchAtLogin: true)

Screenshots

Code standards

• i18n — All user-facing strings use the translation system. New keys added to all locale files.
• Dev Panel — No new internal state requiring Dev Panel exposure.
• CSS — CSS Modules with CSS custom properties. No hardcoded color/spacing values.
• SVGs — SVG assets in separate files, not inlined in TSX.
• Accessibility — Radio inputs are keyboard-navigable with appropriate labels.

Closes #70

[github-actions]

CI Summary

Check	Status
Typecheck	✅ Passed
Lint	✅ Passed
Lint CSS	✅ Passed
Design Tokens	✅ Passed
Test	✅ Passed
Build	✅ Passed

Run #1095

[github-actions]

✅⚠️MegaLinter analysis: Success with warnings

Descriptor	Linter	Files	Fixed	Errors	Warnings	Elapsed time
✅ JSON	jsonlint	10		0	0	0.13s
✅ JSON	npm-package-json-lint	yes		no	no	2.74s
✅ JSON	prettier	10		0	0	0.84s
✅ JSON	v8r	10		0	0	4.13s
✅ MARKDOWN	markdownlint	2		0	0	1.47s
⚠️ MARKDOWN	markdown-table-formatter	2		1	0	0.37s
✅ REPOSITORY	checkov	yes		no	no	25.42s
✅ REPOSITORY	devskim	yes		no	no	2.25s
✅ REPOSITORY	dustilock	yes		no	no	1.33s
✅ REPOSITORY	gitleaks	yes		no	no	1.73s
✅ REPOSITORY	git_diff	yes		no	no	0.31s
✅ REPOSITORY	grype	yes		no	no	47.75s
✅ REPOSITORY	kics	yes		no	no	2.74s
✅ REPOSITORY	kingfisher	yes		no	no	5.73s
✅ REPOSITORY	secretlint	yes		no	no	5.26s
✅ REPOSITORY	syft	yes		no	no	2.61s
✅ REPOSITORY	trivy	yes		no	no	9.88s
✅ REPOSITORY	trivy-sbom	yes		no	no	3.55s
✅ REPOSITORY	trufflehog	yes		no	no	4.34s

Detailed Issues

⚠️ MARKDOWN / markdown-table-formatter - 1 error

1 files contain markdown tables to format:
- README.md

See detailed reports in MegaLinter artifacts
Set VALIDATE_ALL_CODEBASE: true in mega-linter.yml to validate all sources, not only the diff

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