🧹 Refactor executeTextOp in pptxOpExecutor.ts

[MarsLuay]

🎯 What: Extracted the inline switch statement logic within executeTextOp into eight distinct handler functions.
💡 Why: executeTextOp was a long, complex monolithic function. Breaking it down into individual handlers vastly improves readability and maintainability.
✅ Verification: Typechecked using tsc, verified local test suite continues passing, and visually inspected the refactored code using read_file to ensure identical behavior through object reference mutation on the result argument.
✨ Result: A much cleaner, smaller, and well-structured executeTextOp function that delegates work nicely.

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PR created automatically by Jules for task 11055514587041554052 started by @MarsLuay

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