0.2.4 — fix code-editor white screen, rename package to "Exbyte Depot"

- Fix critical crash: opening the built-in code editor blanked the whole app
  (white screen). The editing early-return sat above the syntax-highlight
  useMemo, so entering edit mode changed the hook count and React tore down the
  tree (Rules of Hooks violation). Moved all hooks above the early returns.
- Diff-vs-previous button is now shown only for text/code files, not binaries
  (p4 diff2 on a .uasset only prints "files differ", which is useless).
- Package renamed to "Exbyte Depot" (productName + mainBinaryName); identifier
  unchanged so existing installs upgrade in place.

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

src-tauri/Cargo.toml

@@ -1,6 +1,6 @@
 [package]
 name = "exbyte-depot"
-version = "0.2.3"
+version = "0.2.4"
 description = "Exbyte Depot — native Perforce client by Exbyte Studios"
 authors = ["Exbyte Studios"]
 edition = "2021"