Fix Select prompt failing to accept exact match when items share a common prefix

[Copilot]

• Fix Paginator.TryGetSelectedItem to auto-select an item when the filter keyword is an exact (case-insensitive) match, even if other items also contain the keyword as a substring
• Add tests for the exact-match auto-select scenario (exact match, case-insensitive match, no exact match)
• Resolve merge conflicts with master's new tests in PaginatorTests.cs
• All 163 tests pass (including 16 new tests from master)

Original prompt

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This section details on the original issue you should resolve

<issue_title>Error in single selection from a string array</issue_title>
<issue_description>Dear Tatsuro Shibamura,

it came to my attention that the selection function which offers the single selection
form an array of strings doesn't work if two or more of the strings start with the
same substring.

Please take a look at your own sample program. There you have two pair of strings
which start with the same substring.
"Select" & "SelectWithEnum" and
"MultiSelect" & "MultiSelectWithEnum".

You will not be able to select one of this strings of the former mentioned string
pairs.

Kind regards,

G. Poehlmann.</issue_description>

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

• Fixes Error in single selection from a string array #314

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[shibayan]

@copilot Please resolve conflicts

[Copilot]

@copilot Please resolve conflicts

Resolved in 9cc7a30. The conflict was in PaginatorTests.cs where both master's new tests (#329) and our 3 exact-match tests were appended at the same location. I pulled in master's version and appended our tests after. All 163 tests pass.

[Copilot]

Pull request overview

Fixes a Sharprompt Select prompt edge case where typing a filter that exactly matches an item (case-insensitive) fails to allow selection when other items share the same prefix (e.g., Select vs SelectWithEnum).

Changes:

• Update Paginator.TryGetSelectedItem to auto-select an exact (case-insensitive) match of FilterKeyword even when multiple filtered items exist.
• Add unit tests covering exact match, case-insensitive exact match, and no exact match scenarios.
• Resolve test merge conflicts in PaginatorTests.cs and keep the suite passing.

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated 1 comment.

File	Description
Sharprompt/Internal/Paginator.cs	Adds exact-match selection fallback when no explicit selection exists.
Sharprompt.Tests/PaginatorTests.cs	Adds regression tests for exact-match auto-selection behavior.

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