fix(attdef): SVG dialog buttons, upper-case tags from Properties, Cargo.toml blank line

#1574's dialog drew its pick, close, field and editor buttons with glyph
text (⌖ × ƒ …) that renders as tofu where the font lacks it; they use the
snap and close SVG icons and plain ASCII now. A tag set from Properties is
stored upper case like one from the dialogs, and the stray blank line the
PR left in Cargo.toml is gone.

Co-Authored-By: Claude Opus 5.5 <[email protected]>

Cargo.toml

@@ -94,7 +94,6 @@ objc2-foundation = { version = "0.2", features = ["NSArray", "NSURL", "NSString"
 iced_core = { git = "https://github.com/iced-rs/iced.git", rev = "23604ff22ab0aad9e00b9327cb7b8546ed84db39" }
 iced_widget = { git = "https://github.com/iced-rs/iced.git", rev = "23604ff22ab0aad9e00b9327cb7b8546ed84db39" }
 
-
 [target.'cfg(not(target_arch = "wasm32"))'.dependencies]
 getrandom = "0.3"
 ocs_plugin_api = { path = "crates/ocs_plugin_api", features = ["host"] }