Fix export toolbar overlapping control bar on narrow windows

[shenglol]

Problem

The image export toolbar and the graph control bar overlap when the window width is too narrow. Both are absolutely positioned at top: 16px — the export overlay is centered (left: 50%; transform: translateX(-50%)) while the control bar is pinned top-right (right: 16px). On narrow viewports the wide export toolbar extends into the control bar area.

Fix

• ExportOverlay: Replace center-transform positioning with left: 16px; right: 60px to create a safe zone that reserves space for the control bar. Use display: flex; justify-content: flex-end; overflow: hidden so the toolbar clips from the left when space is tight.
• ExportToolbar: Add flex-shrink: 0; margin: 0 auto so the toolbar centers when there's enough space, but right-aligns (keeping Save As / Close visible) when the container overflows. Remove white-space: nowrap.
• package.json: Register bicep.showVisualDesignerToSide command in the editor title navigation menu.

Behavior

• Wide window: Export toolbar is centered, control bar is visible at top-right — no overlap.
• Narrow window: Export toolbar right-aligns, left-side controls clip off, Save As and Close buttons remain visible, control bar remains accessible.

[github-actions]

Test this change out locally with the following install scripts (Action run 23676069691)

VSCode

• Mac/Linux

  bash <(curl -Ls https://aka.ms/bicep/nightly-vsix.sh) --run-id 23676069691

• Windows

  iex "& { $(irm https://aka.ms/bicep/nightly-vsix.ps1) } -RunId 23676069691"

Azure CLI

• Mac/Linux

  bash <(curl -Ls https://aka.ms/bicep/nightly-cli.sh) --run-id 23676069691

• Windows

  iex "& { $(irm https://aka.ms/bicep/nightly-cli.ps1) } -RunId 23676069691"

[github-actions]

Test this change out locally with the following install scripts (Action run 23676112861)

VSCode

• Mac/Linux

  bash <(curl -Ls https://aka.ms/bicep/nightly-vsix.sh) --run-id 23676112861

• Windows

  iex "& { $(irm https://aka.ms/bicep/nightly-vsix.ps1) } -RunId 23676112861"

Azure CLI

• Mac/Linux

  bash <(curl -Ls https://aka.ms/bicep/nightly-cli.sh) --run-id 23676112861

• Windows

  iex "& { $(irm https://aka.ms/bicep/nightly-cli.ps1) } -RunId 23676112861"