[google-labs-jules]

Add missing reactive-completion tests for task detail screen and view model (issue #135).

• TaskDetailScreenTest: verify UI toggles completion action and dates when view data updates.
• TaskDetailViewModelTest: verify state re-reduces when repository emits task updates.

Closes #135

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PR created automatically by Jules for task 18028432488616796989 started by @MessiasLima

[google-labs-jules]

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