feat: show file change types inline in summary

[flexdinesh]

• Behavior owner/result: ChangeSummary shows total plus added/deleted/modified/renamed counts inline; filtering preserves totals.
• Contracts/modes: existing file statuses, shared local/remote UI. Copied/untracked count as added; type changes/conflicts as modified; renames count once.
• Validation/risks: mise run check:push passed, including full checks, 64 browser tests, Go race tests, and generated-asset drift. Initial hook-test temporary-directory cleanup flake passed three repeats and subsequent full suites.
• Design: compact file icons, semantic colors, hover labels, accessible names; counts stay visible in mobile drawer. Embedded assets rebuilt and committed.
• UI evidence: desktop light/dark and mobile inspected; existing keyboard/browser checks pass. Pierre geometry preserved.