[UserStatistics] Add recent semantic domain column

[Copilot]

Adds a column to the user statistics table showing each user's most recently added semantic domain with timestamp and provenance.

Backend

• Extended SemanticDomainUserCount model with RecentDomain property
• Modified GetSemanticDomainUserCounts to track most recent domain by Created timestamp, removing UserId from returned clone
• Added test verifying correct timestamp comparison and userId removal

Frontend

• Added column between "Domains" and "Words" using DomainChip with provenance enabled
• Updated TypeScript model and factory function to include recentDomain field
• Added translation key statistics.column.recentDomain

The DomainChip component displays the domain ID and name, with hover text showing the creation timestamp and username (fetched separately by the chip).

Original prompt

---

This section details on the original issue you should resolve

<issue_title>[Statistics]</issue_title>
<issue_description>In src/.components/Statistics/UserStatistics.tsx, there's a table with 3 columns. Add a new column that gives the most recent semantic domain added by the user.

Details:

• GetSemanticDomainUserCounts in Backend/Services/StatisticsService.cs will need to also return the semantic domain with the most recent timestamp for each project user
• new UserStatistics.tsx column: recentDomain, right after domainCount
• cell content uses src/components/WordCard/DomainChip.tsx with the following props:
  • provenance: true
  • most recent domain with userId removed</issue_description>

<agent_instructions>Commit messages should satisfy https://github.com/sillsdev/TheCombine/blob/master/.github/workflows/commit_message_check.yml</agent_instructions>

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

• Fixes [UserStatistics] Add column for user's most recent domain #4021

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This change is 

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 74.64%. Comparing base (a54e777) to head (69ef847).
⚠️ Report is 10 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #4022      +/-   ##
==========================================
+ Coverage   74.58%   74.64%   +0.05%     
==========================================
  Files         293      293              
  Lines       10817    10829      +12     
  Branches     1353     1355       +2     
==========================================
+ Hits         8068     8083      +15     
+ Misses       2354     2351       -3     
  Partials      395      395              

Flag	Coverage Δ
backend	85.55% <100.00%> (+0.09%)	⬆️
frontend	66.23% <100.00%> (+<0.01%)	⬆️

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[imnasnainaec]

Before:

After (with hover-text shown for one chip):

[jasonleenaylor]

@jasonleenaylor reviewed 7 of 7 files at r1, all commit messages.
Reviewable status: complete! all files reviewed, all discussions resolved (waiting on @copilot and @imnasnainaec)