Keep focus when tapping within IgnoreKeyboardDismiss

[aniJani]

Resolves #184.

IgnoreKeyboardDismiss had no effect against the TextField's own dismissal. The reported case was mouse input, but the underlying problem is broader — see the table below.

Cause

Not the ignoreNextTap handshake, which fires in the correct order for every pointer kind. EditableText wraps its field in a TapRegion and unfocuses on a tap outside it. That runs on pointer down, before IgnoreKeyboardDismiss sets the flag, and independently of it.

The default tap-outside action unfocuses unconditionally on desktop targets, and for every kind except touch on mobile. Measured against IgnoreKeyboardDismiss before this change:

Target platform	touch	mouse
android / iOS / fuchsia	ok	dismissed
linux / macOS / windows	dismissed	dismissed

Fix

Wrap in TextFieldTapRegion, joining the EditableText tap-region group so taps inside the subtree are no longer "outside" the field. The existing flag still covers dismissals originating from KeyboardDismissOnTap itself, so dismissOnCapturedTaps behaviour is unchanged.

Tests

Two tests in the KeyboardDismissOnTap group, run under TargetPlatformVariant.all(). Nine of the twelve resulting cases fail without the change; the three that pass (touch on mobile targets) guard the previously-working path.

Also verified manually that an interactive child still works as intended — an ElevatedButton wrapped in IgnoreKeyboardDismiss fires onPressed and keeps focus for both pointer kinds, and a tap on an unrelated widget still dismisses.

[codecov-commenter]

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Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 89.24%. Comparing base (42ddef5) to head (ba870b6).
⚠️ Report is 5 commits behind head on master.
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Additional details and impacted files

@@             Coverage Diff             @@
##           master     #192       +/-   ##
===========================================
+ Coverage   76.53%   89.24%   +12.71%     
===========================================
  Files           6        6               
  Lines          98       93        -5     
===========================================
+ Hits           75       83        +8     
+ Misses         23       10       -13     

Files with missing lines	Coverage Δ
...visibility/lib/src/ui/keyboard_dismiss_on_tap.dart	85.29% <100.00%> (+35.29%)	⬆️

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[MisterJimson]

Reviewed after updating onto current master. The focused regression tests pass, all analysis jobs pass, and Android/iOS/macOS/JavaScript/Wasm builds pass. The six publish dry-run jobs are failing because Flutter 3.47.1 rewrites checked-in analysis_options files before package validation; that is repository CI maintenance unrelated to this two-file change.