Preserve repository status in narrow panes

[wrgrant]

What changed

• adds a native right-edge file decoration for every repository row
• shows a clean checkmark or a bounded dirty-file count from 1–99
• prioritizes age and worktree count before a compact middle-ellipsized branch
• middle-ellipsizes unusually long repository names
• preserves complete names, branch, status, path, worktree count, and activity age in tooltips and accessibility labels
• gives repository rows stable IDs so selection survives dirty-state refreshes
• bumps Git Fleet to 0.2.2

Why

The native TreeView does not expose pane width or per-row flex CSS. Long repository and branch names could consume the row and hide the operational context users need most. Native file decorations reserve right-edge space and degrade predictably at narrow widths.

Validation

• pnpm run format
• pnpm run lint
• pnpm run typecheck
• pnpm run test (90 backend, 20 extension, 43 webview)
• pnpm run package
• localization coverage: 129/129 for Simplified and Traditional Chinese
• packaged and installed wgrant-dev.git-fleet@0.2.2 locally

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