Normalize company heading styles

[JayTeeBat]

Summary

• Render every named employer through the same company-heading component.
• Nest single-role positions beneath the employer exactly like multi-role positions.
• Keep single-role dates on the company line so the layout does not repeat identical dates.
• Extend the renderer regression test to compare grouped and single-role employers.

Root cause

Grouped employers used the blue company-name heading, while single-role employers used the dark entry-title pattern as “Position at Company.” Because the markup differed, CSS could not make employer names consistent in heading level, typography, colour, or indentation.

Impact

Forsee Power, McLaren Applied, ARRIVAL, Vantage Power, and Renault now share identical employer heading markup and styling, with roles consistently indented below.

Validation

• 84 non-browser tests passed
• 13 Chromium/PDF/site tests passed
• Codespell passed
• Two-page PDF budget passed
• Desktop Chromium render visually inspected