fix: restore bulk Delete and Duplicate in the helpful wheel

[macayu17]

Description

Selection mode still highlights multiple selected blocks, but the helpful wheel no longer provides any way to bulk delete or duplicate them. As a result, the selection workflow reaches a dead end.

The Move to trash and Duplicate wheel items, along with the code in _displayHelpfulWheel() that reveals them when blocks are selected, were accidentally removed during the i18next migration in #4731.

The underlying deleteMultipleBlocks() and copyMultipleBlocks() actions were preserved and now live in SelectionController following #7765, but they no longer had a UI entry point.

This PR restores the two wheel items and their visibility logic while reusing the existing bulk actions as-is.

Related Issue

Fixes #7794

PR Category

• Bug Fix — Fixes a bug or incorrect behavior

Changes Made

• Re-register the Move to trash and Duplicate helpful wheel items.
• Keep both items hidden by default.
• Connect them to the existing deleteMultipleBlocks() and copyMultipleBlocks() actions.
• Update _displayHelpfulWheel() to show the items only when at least one selected block is not in the trash, matching the behavior before the regression.

Testing Performed

• Manually reproduced the issue on master.

• Verified the fix in the browser using the following flow:

  1. Open Advanced Mode.
  2. Right-click the canvas.
  3. Select Select.
  4. Drag over multiple blocks.
  5. Right-click again.

• Confirmed that Move to trash and Duplicate appear in the wheel.

• Confirmed that both actions apply to all selected blocks.

• Confirmed that both items remain hidden when no blocks are selected.

• Added js/__tests__/activity_helpful_wheel.test.js covering the restored behavior: both items are registered hidden, appear only when at least one selected block is not in the trash, and disappear once the selection is gone.

• Ran the full Jest suite:

  • 190 test suites passed.
  • 6,744 tests passed.

• Ran npm run lint successfully.

• Ran npx prettier --check . successfully.

• Confirmed that linting and formatting checks pass through the pre-commit hook.

Checklist

• I have tested these changes locally and they work as expected.
• I have added/updated tests that prove the effectiveness of these changes.
• I have followed the project's coding style guidelines.
• I have run npm run lint and npx prettier --check . with no errors.

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[codecov]

Codecov Report

❌ Patch coverage is 0% with 8 lines in your changes missing coverage. Please review.
✅ Project coverage is 59.27%. Comparing base (a76b8bb) to head (8727336).

Files with missing lines	Patch %	Lines
js/activity.js	0.00%	8 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #7799      +/-   ##
==========================================
- Coverage   59.28%   59.27%   -0.01%     
==========================================
  Files         176      176              
  Lines       57967    57975       +8     
==========================================
  Hits        34365    34365              
- Misses      23602    23610       +8     

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[walterbender]

Thx for this. Works well. There are some unrelated issues with bulk select -- the highlighting is a bit hit or miss -- and sometimes not every block in a stack is selected, which can cause some inconsistencies. But that is for a separate PR. When I get a chance, I will write up a new ticket.