[Feature Request] Meta-issue: Standardize OSD and notification formatting for file operations

This meta-issue is needed to capture the big picture across related trackers and make it easier to coordinate, discuss, and work on a unified solution. Specifically, it connects:

• https://github.com/libretro/RetroArch/issues/19252
• https://github.com/libretro/RetroArch/issues/16222
• https://github.com/libretro/RetroArch/issues/19246
• https://github.com/libretro/RetroArch/issues/19254

The examples provided in this issue give a clearer, more holistic overview of how these different settings interact and complement each other in practice.

Proposal

Standardize all file operation messages to follow this consistent base structure:

[Status Icon] [Operation] [Full directory path] [Filename] [Directory Title]

• Core Components: [Status Icon], [Operation], and [Filename] are always displayed.
• Optional Modifiers:
• [Full directory path] (#19246) is toggled via Display full directory paths in file operations.
• [Directory Title] (#16222) is toggled via Show directory labels for file operations.

Configuration Options & Examples

*Applies to actions such as Online Updater → Core Downloader → [Selected Core]*

• Default (Minimal):
  • ✅ Extracting "core.zip"
• Default (Minimal) if it fails:
  • ❌ Extracting "core.zip"
• If Show directory labels for file operations is enabled:
  • ✅ Extracting "core.zip" in Core directory
• If Display full directory paths in file operations is enabled:
  • ✅ Extracting "/home/gamer/Downloads/RetroArch-Linux-x86_64/RetroArch-Linux-x86_64.AppImage.home/.config/retroarch/cores/core.zip"

Start by reviewing the linked issues #19252, #16222, #19246, and #19254 to understand the related settings and existing proposals. Then trace the file-operation messages used by Online Updater → Core Downloader and verify that the status icon, operation, filename, optional full path, and optional directory title follow one consistent format.