Make sidebar context menu selection-aware

[bholmesdev]

Closes #86

Summary:

• Preserve existing multi-selection when right-clicking a selected sidebar row.
• Reset selection to the clicked row when right-clicking outside the current selection.
• Hide single-item-only actions for multi-selection and show counted bulk delete for file/folder selections.

Checks:

• pnpm --filter @hubble.md/ui exec vitest run src/components/sidebarSelection.test.ts
• pnpm exec biome check packages/ui/src/components/Sidebar.tsx
• pnpm build:desktop
• pnpm check
• git diff --check

E2E:

• Ran HUBBLE_DESKTOP_ENABLE_CDP=1 pnpm dev:desktop.
• Verified multi-file selection right-click shows only "Delete 2 items".
• Verified right-clicking outside selection resets selection and shows normal single-file menu.
• Verified mixed folder/file selection shows only "Delete 2 items".

Notes:

• Desktop build warns that apps/web wants Node 22.x while current runtime is Node v24.14.0; build/check still pass.

[vercel]

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Project	Deployment	Actions	Updated (UTC)
hubble-md-web	Ready	Preview, Comment	Jun 30, 2026 9:20pm