when -> tasks go to grey, due to them being merged; they seem to jump

[moltenbot000]

Proposed changes from Molten.Bot

This PR implements the requested changes described below.
Built using AI-assisted engineering and reviewed before submission.
Only relevant files were modified.

Original task prompt:

Update the existing pull request to address review feedback.

Original task prompt:
  when -> tasks go to grey, due to them being merged; they seem to jump around alot on the ui; and there is duplication.
  They should not be duplicated, they should just have their css style updated. same with not bouncing around...

Pull request:
- URL: https://github.com/Molten-Bot/moltenhub-code/pull/1044
- Title: when -> tasks go to grey, due to them being merged; they seem to jump
- Head branch to update: moltenhub-when-tasks-go-to-grey-due-to-them-being
- Base branch: main

Review feedback to address:
1. review by jefking (COMMENTED):
  [Medium] internal/web/static/index.html:10502 - Same-ID reorders are frozen

Requirements:
- Work on the existing pull request branch named above; do not create a separate PR.
- Keep the original task scope, but make the changes needed to satisfy the review feedback.
- Add or update tests when the feedback describes behavior that can regress.
- Preserve unrelated code and avoid broad refactors.
- Push the fix to the same PR branch so the existing pull request is updated.

Curious how this was built? See how AI agents can help with your own projects: MoltenBot Code

[jefking]

Positive

• The PR removes the same-ID reorder freeze and keeps existing task cards stable until the delayed sync window.
• The completed-history filter now dedupes live merged tasks against completed history instead of rendering duplicate cards.
• The regression assertion covers the reorder branch that previously blocked same-ID ordering changes.

Negative

• No material issues found.