fix(iOS): merge inline style with plain text

[kacperzolkiewski]

Summary

This PR fixes merging inline style with plain text.
This regression was introduced in this PR: #551

Test Plan

1. run example app
2. toggle bold
3. type first line
4. toggle off bold
5. type second
6. go with the cursor before second and remove last bolded letter
7. bold style should not exceed on second word

Screenshots / Videos

Before:

Screen.Recording.2026-07-23.at.10.25.53.mov

After:

Screen.Recording.2026-07-23.at.10.26.17.mov

Compatibility

OS	Implemented
iOS	✅
Android	❌
Web	❌

Checklist

• E2E tests are passing
• Required E2E tests have been added (if applicable)

[Copilot]

Pull request overview

Fixes an iOS regression where inline meta-attributes (e.g., bold) could incorrectly “bleed” into adjacent plain text when edits involve replacements/deletions, and adds an E2E flow to validate the behavior.

Changes:

• iOS: restricts attribute-capture logic during shouldChangeTextInRange to avoid capturing on deletions.
• E2E: adds a Maestro flow reproducing and asserting the inline-style merge scenario via screenshot.

Reviewed changes

Copilot reviewed 2 out of 4 changed files in this pull request and generated no comments.

File	Description
ios/EnrichedTextInputView.mm	Adjusts attribute capture conditions during text replacement to prevent style leakage on iOS.
.maestro/enrichedInput/flows/inline_styles_merge.yaml	Adds an automated Maestro flow to reproduce/assert correct inline-style merge behavior.

Comments suppressed due to low confidence (1)

ios/EnrichedTextInputView.mm:1929

• attributesAtIndex: will throw if range.location is out of bounds. Also, when this method returns NO (e.g. for submit/return handling), _capturedAttributesBeforeChange is left set and can be incorrectly applied to the next edit in didProcessEditing:. Consider guarding the index and clearing the captured attributes before early NO returns.

  // replacement. Only capture for genuine replacements (text.length > 0), not
  // for deletions/backspace (text.length == 0).
  if (range.length > 0 && text.length > 0) {
    _capturedAttributesBeforeChange =
        [textView.textStorage attributesAtIndex:range.location
                                 effectiveRange:NULL];
  }

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