Refactor text utilities and expand their usage

This commit refactors existing text utility functions into the
application layer for broad reuse and integrates them across
the codebase. Initially, these utilities were confined to test
code, which limited their application.

Changes:

- Move text utilities to the application layer.
- Centralize text utilities into dedicated files for better
  maintainability.
- Improve robustness of utility functions with added type checks.
- Replace duplicated logic with centralized utility functions
  throughout the codebase.
- Expand unit tests to cover refactored code parts.

src/application/Context/State/Code/Event/CodeChangedEvent.ts

@@ -1,6 +1,7 @@
 import type { Script } from '@/domain/Executables/Script/Script';
 import type { ICodePosition } from '@/application/Context/State/Code/Position/ICodePosition';
 import type { SelectedScript } from '@/application/Context/State/Selection/Script/SelectedScript';
+import { splitTextIntoLines } from '@/application/Common/Text/SplitTextIntoLines';
 import type { ICodeChangedEvent } from './ICodeChangedEvent';
 
 export class CodeChangedEvent implements ICodeChangedEvent {
@@ -52,12 +53,12 @@ export class CodeChangedEvent implements ICodeChangedEvent {
 }
 
 function ensureAllPositionsExist(script: string, positions: ReadonlyArray<ICodePosition>) {
-  const totalLines = script.split(/\r\n|\r|\n/).length;
+  const totalLines = splitTextIntoLines(script).length;
   const missingPositions = positions.filter((position) => position.endLine > totalLines);
   if (missingPositions.length > 0) {
     throw new Error(
       `Out of range script end line: "${missingPositions.map((pos) => pos.endLine).join('", "')}"`
-        + `(total code lines: ${totalLines}).`,
+        + ` (total code lines: ${totalLines}).`,
     );
   }
 }

src/application/Context/State/Code/Generation/CodeBuilder.ts

@@ -1,3 +1,4 @@
+import { splitTextIntoLines } from '@/application/Common/Text/SplitTextIntoLines';
 import type { ICodeBuilder } from './ICodeBuilder';
 
 const TotalFunctionSeparatorChars = 58;
@@ -15,7 +16,7 @@ export abstract class CodeBuilder implements ICodeBuilder {
       this.lines.push('');
       return this;
     }
-    const lines = code.match(/[^\r\n]+/g);
+    const lines = splitTextIntoLines(code);
     if (lines) {
       this.lines.push(...lines);
     }