fix: BibleTextNode whitespace parsing

[davidfedor]

Motivation

• The previous parser used a pending-whitespace stack to track inter-node spaces which introduced extra state and complexity; a per-chunk collapsing approach is simpler while still preserving inline spacing semantics.

Description

• Replace the Delegate pending-whitespace machinery with a simplified parser(_:foundCharacters:) that collapses runs of whitespace to a single space and treats a standalone " " segment as renderable only when the previous child is an inline/text node.
• Merge appended segments into existing adjacent text nodes while collapsing repeated spaces and avoid inserting spaces before non-inline previous nodes.
• Update Sources/YouVersionPlatformCore/Bible/BibleTextNode.swift to remove the pendingWhitespace stack and related helper functions and apply the new foundCharacters logic.
• Add and keep regression tests in Tests/YouVersionPlatformCoreTests/BibleTextNodeTests.swift to cover spaces between inline spans, mixed whitespace collapse, and leading-whitespace behavior.

Testing

• Ran swift test and the full test suite passed (191 tests passed).
• Ran SwiftLint with LINUX_SOURCEKIT_LIB_PATH=/root/.local/share/swiftly/toolchains/6.1.3/usr/lib swiftlint --strict and found 0 violations.

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[github-actions]

LCOV of commit 046911a during Unit Tests #101

	(use "lcov --ignore-errors deprecated,deprecated ..." to suppress this warning)
Reading tracefile /var/folders/2m/bm_csnqx7ql9dfhv0kjgqhw80000gn/T/__zgosalvez_github-actions-report-lcov/lcov.info.
Summary coverage rate:
  source files: 70
  lines.......: 68.0% (4729 of 6959 lines)
  functions...: 57.9% (541 of 935 functions)
  branches....: no data found
Message summary:
  1 warning message:
    deprecated: 1

Files changed coverage rate: n/a