feat: add select multiple rows with shift

[geekyharsh05]

Closes #130

[railway-app]

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[Copilot]

Pull request overview

This PR adds shift-click and keyboard navigation functionality to enable multi-row selection in database tables. Users can now select ranges of rows using Shift+Click or Shift+Arrow keys, improving the table interaction experience.

Key Changes:

• Introduced SelectionState and LastClickedIndex contexts to track selection state across components
• Implemented shift-click handler in checkboxes to select row ranges
• Added keyboard navigation (Shift+ArrowUp/Down) for expanding/shrinking selection ranges

Reviewed changes

Copilot reviewed 4 out of 4 changed files in this pull request and generated 7 comments.

File	Description
apps/desktop/src/routes/(protected)/_protected/database/$id/table/-store.ts	Adds new context definitions and types for tracking selection state and last clicked index
apps/desktop/src/routes/(protected)/_protected/database/$id/table/index.tsx	Initializes refs and provides selection contexts to child components
apps/desktop/src/routes/(protected)/_protected/database/$id/table/-components/table.tsx	Implements keyboard event handler for Shift+Arrow navigation and makes table focusable
apps/desktop/src/routes/(protected)/_protected/database/$id/table/-components/table-selection.tsx	Updates checkbox click handler to support shift-click range selection

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[Rudra-Sankha-Sinhamahapatra]

Looks good

[Rudra-Sankha-Sinhamahapatra]

Looks Good