Fix: move allotment from devDependencies to dependencies

[Copilot]

allotment — the library used for draggable/resizable panel splitting — was declared under devDependencies despite being imported directly in production source files.

Changes

• package.json: moved allotment@1.19.0 from devDependencies → dependencies

Context

allotment is used in two production files:

• src/index.tsx — imports allotment/dist/style.css
• src/components/organisms/ExplorerPane/ExplorerPane.tsx — renders the vertically-split, resizable File/Dry-runs panes

import {Allotment} from 'allotment';

<StyledAllotment vertical>
  <Allotment.Pane minSize={PANEL_HEADER_HEIGHT + 16}>
    <FilePane key="files" />
  </Allotment.Pane>
  <Allotment.Pane minSize={54}>
    <DryRunsPane key="dry-runs" />
  </Allotment.Pane>
</StyledAllotment>

The main panel layout (PaneManager) uses ResizableColumnsPanel / ResizableRowsPanel from @monokle/components, which are also allotment-backed.

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