fix(builder): watch for pages/ creation when default page displayed

[atinux]

Types of changes

• Bug fix (a non-breaking change which fixes an issue)
• New feature (a non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)

Description

Same as store/ but applied for pages/ creation.

Checklist:

• I have added tests to cover my changes (if not applicable, please state why)
• All new and existing tests are passing.

[codecov-io]

Codecov Report

Merging #5753 into dev will decrease coverage by 0.03%.
The diff coverage is 66.66%.

@@            Coverage Diff            @@
##              dev   #5753      +/-   ##
=========================================
- Coverage   95.64%   95.6%   -0.04%     
=========================================
  Files          82      82              
  Lines        2661    2663       +2     
  Branches      682     683       +1     
=========================================
+ Hits         2545    2546       +1     
- Misses         98      99       +1     
  Partials       18      18

Flag	Coverage Δ
#e2e	100% <ø> (ø)	⬆️
#fixtures	50.65% <0%> (-0.04%)	⬇️
#unit	92.56% <66.66%> (-0.04%)	⬇️

Impacted Files	Coverage Δ
packages/builder/src/builder.js	99.6% <66.66%> (-0.4%)	⬇️

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