fix(plugin): improve buddy rendering alignment for wide characters

[JeremyDev87]

Summary

• Add display-width-aware text rendering utilities (display_width, pad_to_display_width, truncate_to_display_width, truncate_left_to_display_width) using unicodedata
• Extract reusable render_face_banner, render_section_header, and render_box_line helpers
• Fix face box misalignment when custom/wide Unicode faces are used (e.g., CJK, emoji)
• Fix Intelligence Report and Impact Report box lines breaking alignment with wide text
• Dynamic box width calculation based on actual content display width
• Fix face variable shadowing in render_session_summary that caused wrong face in farewell line

Test plan

• New test: test_render_buddy_face_box_scales_for_longer_face — verifies top rule width matches custom face
• New test: test_render_session_summary_farewell_keeps_buddy_face_when_agents_exist — verifies farewell uses buddy face, not agent face
• New test: test_box_lines_share_same_display_width_for_wide_text — verifies Intelligence Report alignment with Korean text
• New test: test_impact_report_box_aligns_with_wide_text — verifies Impact Report alignment with Korean text
• New test: test_custom_face_banner_keeps_top_and_bottom_aligned — verifies onboarding tour banner alignment
• All existing tests pass (71 TS + Python tests)
• 100% statement/function coverage maintained

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Project	Deployment	Actions	Updated (UTC)
codingbuddy-landing	Ready	Preview, Comment	Apr 3, 2026 2:23pm