find: avoid panic on -printf width above u16::MAX

[SAY-5]

find -printf "%111111c" (or any directive with a width above 65535) panics with Formatting argument out of range, as reported in #693. The width is passed straight into {content:>width$}, but the formatting machinery caps a runtime width at u16::MAX and panics for anything larger.

This pads the field by hand with str::repeat instead, so the output matches the requested width for any value and large widths no longer crash. Added a regression test that exercises a width of 100000.

Closes #693

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 91.88%. Comparing base (1ac5fe4) to head (584786c).
⚠️ Report is 2 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #746   +/-   ##
=======================================
  Coverage   91.87%   91.88%           
=======================================
  Files          35       35           
  Lines        7152     7159    +7     
  Branches      376      376           
=======================================
+ Hits         6571     6578    +7     
  Misses        437      437           
  Partials      144      144           

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[codspeed-hq]

Merging this PR will not alter performance

✅ 20 untouched benchmarks

---

_{Comparing SAY-5:fix-printf-large-width (584786c) with main (1ac5fe4)}

[github-actions]

Commit 0eb072b has test result changes:

bfs testsuite:

Test results comparison:
  Current:   TOTAL: 314 / PASSED: 267 / FAILED: 41 / SKIPPED: 6
  Reference: TOTAL: 313 / PASSED: 267 / FAILED: 40 / SKIPPED: 6

Changes from main branch:
  TOTAL: +1
  PASSED: +0
  FAILED: +1

New test failures (1):
  - gnu/okdir_path_empty

[github-actions]

Commit 584786c has test result changes:

bfs testsuite:

Test results comparison:
  Current:   TOTAL: 314 / PASSED: 267 / FAILED: 41 / SKIPPED: 6
  Reference: TOTAL: 313 / PASSED: 267 / FAILED: 40 / SKIPPED: 6

Changes from main branch:
  TOTAL: +1
  PASSED: +0
  FAILED: +1

New test failures (1):
  - gnu/files0_from_ok

[HackingRepo]

that issue already fixed, @SAY-5