chore: rebrand from Kon/Corbie to Magnotia

Replace all instances of the legacy product names "Kon" and "Corbie" with
"Magnotia" across user-facing copy, code identifiers, package names, bundle
ids, file paths, and documentation. Preserves the unrelated "konsole" (KDE
terminal) reference and the parent CORBEL company name.

- Renames 10 Rust crates (kon-* → magnotia-*) and the tauri binary
- Updates package.json, tauri.conf.json (productName + identifier)
- Renames CSS classes (kon-rh-* → magnotia-rh-*) and animations
- Renames brand and roadmap docs
- Regenerates Cargo.lock and package-lock.json

Verified: svelte-check passes; pure-rust crates compile under new names.

docs/dev-setup.md

@@ -2,10 +2,10 @@
 name: dev-setup
 type: reference
 tags: [setup, dependencies, build, linux, fedora]
-description: Authoritative build dependencies and launch instructions for Kon on Fedora Linux
+description: Authoritative build dependencies and launch instructions for Magnotia on Fedora Linux
 ---
 
-# Kon — Developer Setup
+# Magnotia — Developer Setup
 
 Last updated: 2026/04/18. Primary dev target: Fedora 43, x86_64, KDE Wayland, NVIDIA RTX 4070.
 
@@ -67,7 +67,7 @@ Rust toolchain managed by `rustup`. No extra steps needed beyond what Tauri requ
 ### CPU build (default)
 
 ```bash
-cd /home/jake/Documents/CORBEL-Projects/kon
+cd /home/jake/Documents/CORBEL-Projects/magnotia
 LIBCLANG_PATH=/usr/lib64/llvm21/lib64 npm run tauri dev
 ```