v0.3.4 — workspace View include/exclude tree + fix oversized button icons

- Edit-workspace dialog gets a P4V-style folder tree with tri-state include/
  exclude checkboxes (lazy-loaded via p4 dirs). Toggling writes the depot→client
  View mapping (`//depot/Foo/...` or `-//depot/Foo/...`) — i.e. what syncs and
  what doesn't. Tree/Text mode toggle; after Save it offers Get Latest.
- Fix: .mbtn buttons weren't flex and didn't cap their <svg>, so an icon inside
  (e.g. the lock on "Add recommended Unreal rules") blew up to fill the button.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

src-tauri/Cargo.toml

@@ -1,6 +1,6 @@
 [package]
 name = "exbyte-depot"
-version = "0.3.3"
+version = "0.3.4"
 description = "Exbyte Depot — native Perforce client by Exbyte Studios"
 authors = ["Exbyte Studios"]
 edition = "2021"