Replace len([]rune) with lipgloss.Width for correct terminal column counting

[joshuacrass]

Problem:
In render.go, width is calculated using len([]rune(plain)):

pad := cols - len([]rune(plain)) - 4

len([]rune(s)) counts Unicode code points, not terminal display columns. CJK characters and certain emoji occupy 2 terminal columns each, so this calculation produces an incorrect result for any string containing wide characters, leading to misaligned or wrapped output.

Solution:
Replace len([]rune(s)) with lipgloss.Width(s) which uses a proper display-width algorithm consistent with the rest of the codebase.

Acceptance Criteria:

• All width calculations in render.go use lipgloss.Width instead of len([]rune(…))
• Status bar renders correctly for repo names or strings containing wide Unicode characters