TF-50: Add text search for tasks

[Copilot]

Implements real-time text search filtering for tasks by title and description with URL state persistence.

Changes

• Server action: searchTasks() filters tasks using case-insensitive CONTAINS query, minimum 3 characters required
• Client component: TasksPageClient wraps task list with search UI (magnifying glass icon, clear button, filter button stub)
• Empty state: EmptyState component displays when search yields no results
• URL persistence: Search query synced to URL params via pushState, restored on page load and browser navigation
• Debouncing: 300ms delay before triggering search to reduce query volume

// Search is case-insensitive and searches both fields
await prisma.task.findMany({
  where: {
    OR: [
      { name: { contains: query, mode: 'insensitive' } },
      { description: { contains: query, mode: 'insensitive' } },
    ],
  },
  // ...
});

Security

• Removed password fields from task query responses (assignee/creator selects)

Testing

• 15 unit tests covering search action, client component, and empty state
• 13 E2E tests covering search flows, URL persistence, and edge cases

Original prompt

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This section details on the original issue you should resolve

<issue_title>TF-50 Add Text Search for Tasks</issue_title>
<issue_description> Implement the work described in Jira ticket TF-50, including looking at any Figma files mentioned. When finished, transition the ticket to "In Reivew".

To do the work use the following prompt chain which describes steps for best implementing the feature:

1. Open the repository on GitHub: https://github.com/bitovi/ai-enablement-prompts.
2. Execute the prompt writing-code/generate-feature/generate-feature.md</issue_description>

Comments on the Issue (you are @copilot in this section)

• Fixes TF-50 Add Text Search for Tasks #288

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