feat(string): add strTruncate, and strCount utilities

[nev21]

• strTruncate: Truncate strings to maximum length with optional suffix support

  • Preserves hard max length boundary (suffix included within limit)
  • Truncates suffix if needed to maintain max length constraint
  • Type coercion via asString(); throws for null/undefined

• strCount: Count non-overlapping substring occurrences

  • Returns 0 for empty search strings (prevents unbounded matches)
  • Type coercion via asString(); throws for null/undefined

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 98.83%. Comparing base (4f3d60a) to head (1e7fcd1).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #529      +/-   ##
==========================================
+ Coverage   98.81%   98.83%   +0.01%     
==========================================
  Files         136      138       +2     
  Lines        3973     4019      +46     
  Branches      849      858       +9     
==========================================
+ Hits         3926     3972      +46     
  Misses         47       47              

Files with missing lines	Coverage Δ
lib/src/string/count.ts	100.00% <100.00%> (ø)
lib/src/string/truncate.ts	100.00% <100.00%> (ø)

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[Copilot]

Pull request overview

Adds two new string utilities to @nevware21/ts-utils (strTruncate and strCount) along with common-suite tests, public exports, documentation updates, and adjusted bundle-size limits to accommodate the added functionality.

Changes:

• Introduce strTruncate() (max-length truncation with optional suffix) and strCount() (non-overlapping substring occurrence counting).
• Add common tests for both new utilities and export them from the package index.
• Update docs/README usage examples and bump size thresholds in bundle checks.

Reviewed changes

Copilot reviewed 10 out of 10 changed files in this pull request and generated 5 comments.

Show a summary per file

File	Description
lib/src/string/truncate.ts	New strTruncate implementation with suffix support and max-length boundary behavior.
lib/src/string/count.ts	New strCount implementation for counting non-overlapping matches.
lib/src/index.ts	Exposes strCount and strTruncate from the public API.
lib/test/src/common/string/truncate.test.ts	Adds coverage for truncation behavior, suffix handling, and null/undefined input throwing.
lib/test/src/common/string/count.test.ts	Adds coverage for counting semantics, empty matcher behavior, and null/undefined input throwing.
docs/usage-guide.md	Documents new string helpers in the usage snippet.
README.md	Adds new helpers to the public utilities matrix/links.
docs/feature-backlog.md	Updates backlog organization and removes completed items from the list.
lib/test/bundle-size-check.js	Increases bundle-size thresholds for minified bundles.
.size-limit.json	Increases size-limit thresholds for ES5/ES6 full builds.

[Copilot]

Pull request overview

Copilot reviewed 10 out of 10 changed files in this pull request and generated 2 comments.

[Copilot]

Pull request overview

Copilot reviewed 10 out of 10 changed files in this pull request and generated 3 comments.

[Copilot]

Pull request overview

Copilot reviewed 10 out of 10 changed files in this pull request and generated 2 comments.

[nevware21-bot]

Approved by nevware21-bot