feat: slide images moved to slides/img/, direct path in TOML, slides_test binary

- Moved 16 slide PNGs from assets/ to slides/img/
- Replaced [icons] mapping section with direct paths in icon field
- Added slides_test standalone binary for testing slideshows
- Added default-run = "yali-rs" in Cargo.toml to fix cargo run ambiguity
- Fixed edit dialog auto-resize and text field wrapping in partition.rs
- Updated branding.rs to load external slides from slides/ directory
- Removed [slides] section from branding.toml files
- Revamped CopyFilesJob with find-based progress tracking (rsync --out-format)
- Fixed install progress bar visibility logic
- Tweaked auto-install CLI output with sub-progress and current file
- Switched language-icon.svg to white fills for dark theme
- Minor locale fixes

assets/icons/language-icon.svg

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