refactor(frontend): TouchEventとMouseEventをPointerEventに統合

[kakkokari-gtyih]

What

• MouseEventとTouchEventを両方受け付けている箇所を統一できる

Why

Additional info (optional)

MkSwiperは別途作業中 → #17101

For next release (v2026.2.0に入れない）

Checklist

• Read the contribution guide
• Test working in a local environment
• (If needed) Add story of storybook
• (If needed) Update CHANGELOG.md
• (If possible) Add tests

[codecov]

Codecov Report

❌ Patch coverage is 0% with 57 lines in your changes missing coverage. Please review.
✅ Project coverage is 13.79%. Comparing base (71f50d3) to head (0c65a21).
⚠️ Report is 3 commits behind head on develop.

Files with missing lines	Patch %	Lines
...ckages/frontend/src/components/MkPullToRefresh.vue	0.00%	38 Missing and 16 partials ⚠️
...es/frontend/src/components/global/MkPageHeader.vue	0.00%	2 Missing and 1 partial ⚠️

Additional details and impacted files

@@             Coverage Diff              @@
##           develop   #17201       +/-   ##
============================================
- Coverage    63.50%   13.79%   -49.72%     
============================================
  Files         1161      241      -920     
  Lines       115966    11703   -104263     
  Branches      8367     3956     -4411     
============================================
- Hits         73650     1614    -72036     
+ Misses       40126     7912    -32214     
+ Partials      2190     2177       -13     

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