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.

src-tauri/src/lib.rs

@@ -10,9 +10,9 @@ use std::time::Instant;
 use sqlx::SqlitePool;
 use tauri::Manager;
 
-use kon_core::types::EngineName;
-use kon_llm::LlmEngine;
-use kon_storage::{
+use magnotia_core::types::EngineName;
+use magnotia_llm::LlmEngine;
+use magnotia_storage::{
     database_path, get_setting, init as init_db, prune_error_log, set_setting,
 };
 
@@ -20,7 +20,7 @@ use kon_storage::{
 /// 90 days is long enough to triage "this happened a few weeks ago"
 /// reports and short enough that the table stays kilobyte-scale.
 const ERROR_LOG_RETENTION_DAYS: i64 = 90;
-use kon_transcription::LocalEngine;
+use magnotia_transcription::LocalEngine;
 
 /// Shared app state holding the transcription engines and database pool.
 pub struct AppState {
@@ -75,7 +75,7 @@ async fn save_preferences(
     state: tauri::State<'_, AppState>,
     preferences: String,
 ) -> Result<(), String> {
-    set_setting(&state.db, "kon_preferences", &preferences)
+    set_setting(&state.db, "magnotia_preferences", &preferences)
         .await
         .map_err(|e| e.to_string())
 }
@@ -197,7 +197,7 @@ pub fn run() {
             // Load saved preferences for webview injection
             let t1 = Instant::now();
             let prefs_json = tauri::async_runtime::block_on(async {
-                get_setting(&db, "kon_preferences").await.unwrap_or(None)
+                get_setting(&db, "magnotia_preferences").await.unwrap_or(None)
             });
             eprintln!("[startup] Preferences load: {:?}", t1.elapsed());
             let init_script = build_preferences_script(prefs_json);
@@ -439,5 +439,5 @@ pub fn run() {
             commands::update::install_update,
         ])
         .run(tauri::generate_context!())
-        .expect("error while running Kon");
+        .expect("error while running Magnotia");
 }