Fix SenseCard horizontal overflow in MergeDupsCompleted WordCard

[Copilot]

In Data Cleanup's completed Merge Duplicates view, SenseCard could overflow its WordCard horizontally when the word card was narrow — producing an unwanted horizontal scrollbar.

Root cause: SenseCard had minWidth: 150. With MUI CardContent's 16px left/right padding, a WordCard ~190px wide leaves only ~158px of usable space, but the sense card with m: 1 margins needed ≥166px minimum.

Changes (MergeDupsCompleted.tsx)

• Remove minWidth: 150 from SenseCard — sense card should size to available width; maxWidth: 300 is retained to cap width in wider layouts
• Add overflowX: "hidden" to WordCard content div — guards against any residual horizontal overflow

- <div style={{ maxHeight: "55vh", overflowY: "auto" }}>
+ <div style={{ maxHeight: "55vh", overflowX: "hidden", overflowY: "auto" }}>

  sx={{
    bgcolor: "white",
    m: 1,
    maxWidth: 300,
-   minWidth: 150,
    userSelect: "none",
  }}

Original prompt

---

This section details on the original issue you should resolve

<issue_title>[MergeDupsComplete>MergeChange] Sense x-overflowing word</issue_title>
<issue_description>Describe the bug

In Data Cleanup, under "You've Completed", you can click on a "Merge Duplicates" tile to see completed merges. The MergeChange component uses the WordCard component. When the sense and its surrounding word are both narrow, there is somehow a horizontal overflow triggered. See screenshot example:

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

• Fixes [MergeDupsComplete>MergeChange] Sense x-overflowing word #4205

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This change is 

[github-actions]

⚠️ Commit Message Format Issues ⚠️
commit b3ebc0c26b:
3: B1 Line exceeds max length (82>80): "- Remove minWidth: 150 from SenseCard to prevent overflow when container is narrow"

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 66.34%. Comparing base (c6afad4) to head (b3ebc0c).

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #4206      +/-   ##
==========================================
- Coverage   75.15%   66.34%   -8.81%     
==========================================
  Files         302      246      -56     
  Lines       11099     6254    -4845     
  Branches     1394      791     -603     
==========================================
- Hits         8341     4149    -4192     
+ Misses       2357     1846     -511     
+ Partials      401      259     -142     

Flag	Coverage Δ
backend	?
frontend	66.34% <ø> (ø)

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