Add synchronized fleet and graph controls

[wrgrant]

What changed

• separates repository layout from sort order, including sort-within-tree behavior
• synchronizes graph repository selection back to the native Git Fleet navigator
• fixes clean-repository eye semantics and limits collapse-all to tree layout
• rebuilds the graph toolbar for narrow panels with bounded selectors and non-overlapping worktrees
• adds commit search, worktree visibility, terminal, fetch, settings, and repository hover actions
• includes stash history alongside existing tag support
• bumps the extension to 0.2.0 and updates release docs and localization

Why

The fleet navigator and graph were useful independently but did not yet behave like one application. Narrow graph panels also allowed the worktree rail and wrapped controls to collide.

Validation

• pnpm run format
• pnpm run lint
• pnpm run typecheck
• pnpm run test (90 backend, 15 extension, 43 webview)
• pnpm run package
• localization coverage: 121/121 for Simplified and Traditional Chinese
• packaged and installed wgrant-dev.git-fleet@0.2.0 locally

The VS Code integration runner compiled successfully, but the downloaded temporary test app triggered macOS Gatekeeper because the current stable bundle executable name no longer matches the test harness expectation. No assertion failure was observed.

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