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/tests/smoke.rs

@@ -6,20 +6,20 @@
 //! - `context::params::LlamaContextParams`
 //! - `sampling::LlamaSampler`
 //!
-//! The test is gated behind `KON_LLM_TEST_MODEL`.
+//! The test is gated behind `MAGNOTIA_LLM_TEST_MODEL`.
 
 use std::env;
 use std::path::PathBuf;
 
-use kon_llm::LlmEngine;
-use kon_llm::LlmModelId;
+use magnotia_llm::LlmEngine;
+use magnotia_llm::LlmModelId;
 
 #[test]
 fn llama_cpp_2_smoke_generates_and_wraps() {
-    let model_path = match env::var("KON_LLM_TEST_MODEL") {
+    let model_path = match env::var("MAGNOTIA_LLM_TEST_MODEL") {
         Ok(path) => PathBuf::from(path),
         Err(_) => {
-            eprintln!("KON_LLM_TEST_MODEL not set — skipping");
+            eprintln!("MAGNOTIA_LLM_TEST_MODEL not set — skipping");
             return;
         }
     };
@@ -32,7 +32,7 @@ fn llama_cpp_2_smoke_generates_and_wraps() {
     let completion = engine
         .generate(
             "Write exactly one short greeting.",
-            &kon_llm::GenerationConfig {
+            &magnotia_llm::GenerationConfig {
                 max_tokens: 32,
                 temperature: 0.0,
                 stop_sequences: vec!["\n".to_string()],