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.

crates/llm/Cargo.toml

@@ -1,12 +1,12 @@
 [package]
-name = "kon-llm"
+name = "magnotia-llm"
 version = "0.1.0"
 edition = "2021"
 
 [features]
 # Default desktop build keeps the existing openmp + vulkan acceleration.
 # Mobile / CPU-only targets can drop one or both via:
-#   cargo build -p kon-llm --no-default-features
+#   cargo build -p magnotia-llm --no-default-features
 # These are independent so an Android Vulkan build can opt into vulkan
 # without openmp (the NDK ships OpenMP libs but the toolchain configuration
 # is fragile across NDK versions).
@@ -15,7 +15,7 @@ gpu-vulkan = ["llama-cpp-2/vulkan"]
 openmp = ["llama-cpp-2/openmp"]
 
 [dependencies]
-kon-core = { path = "../core" }
+magnotia-core = { path = "../core" }
 encoding_rs = "0.8"
 futures-util = "0.3"
 llama-cpp-2 = { version = "0.1.144", default-features = false }