PowerRenamer Updates

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• Core Engine & Speed: Updated parsing algorithm with a token-based parser.
• Experience: Added $case[type]$ token for batch case modification:

  $case[upper]$	Makes the following text uppercase.
  $case[lower]$	Makes the following text lowercase.
  $case[normal]$	Gives the following text its original casing.

• Interface: Made main window resizable and responsive.

• Safety & Validation: Added validation before pattern application to block illegal Windows characters (\ / : * ? " < > |) and reserved system names (CON, PRN, AUX, etc.).
• Performance & Safety: Implemented O(1) hash-set path verification to instantly prevent duplicate file entries during drag-and-drop and file addition operations.
• Interface: Changed main window title for consistency.

• Core Engine: Introduced dynamic pattern token parsing for inline string formatting ($filename$, $index[n]$, $ext$).
• Interface: Added real-time token preview column showing immediate rename results before executing.
• Safety: Implemented automatic collision indexing to increment duplicate target filenames safely.