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/commands/intentions.rs

@@ -7,7 +7,7 @@
 use serde::{Deserialize, Serialize};
 use uuid::Uuid;
 
-use kon_storage::{
+use magnotia_storage::{
     delete_implementation_rule as db_delete_rule, get_task_by_id,
     insert_implementation_rule as db_insert_rule, list_implementation_rules as db_list_rules,
     mark_implementation_rule_fired as db_mark_rule_fired,