fix: prevent app card meta overflow

[Jingyi-Dify]

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Summary

Fixes Linear SNP-509.

This PR prevents the app card footer metadata from overlapping the bottom-right access-mode icon when the author/time text is too long. The footer row now clips overflowing content, and the edited time text can shrink and truncate instead of forcing the row into the decorative icon area.

From Codex

Screenshots

Before	After
Footer metadata could run underneath the bottom-right access icon when space was tight.	Footer metadata stays within the available row width and truncates before the icon area.

Checklist

• This change requires a documentation update, included: Dify Document
• I understand that this PR may be closed in case there was no previous discussion or issues. (This doesn't apply to typos!)
• I've added a test for each change that was introduced, and I tried as much as possible to make a single atomic change.
• I've updated the documentation accordingly.
• I ran make lint && make type-check (backend) and cd web && pnpm exec vp staged (frontend) to appease the lint gods

Validation:

• CI=true pnpm -C web test app/components/apps/__tests__/app-card.spec.tsx
• CI=true pnpm -C web exec eslint app/components/apps/app-card.tsx app/components/apps/__tests__/app-card.spec.tsx failed on pre-existing a11y lint issues outside this diff.
• CI=true pnpm -C web exec vp staged failed because the current vite.config.ts has no staged config.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 85.29%. Comparing base (57f687f) to head (7225538).

Additional details and impacted files

@@           Coverage Diff           @@
##             main   #38349   +/-   ##
=======================================
  Coverage   85.29%   85.29%           
=======================================
  Files        4981     4981           
  Lines      263425   263425           
  Branches    50019    50019           
=======================================
  Hits       224694   224694           
  Misses      34343    34343           
  Partials     4388     4388           

Flag	Coverage Δ
dify-ui	94.93% <ø> (ø)
web	84.86% <ø> (ø)

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[hjlarry]

LGTM