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/storage/src/file_storage.rs

@@ -1,28 +1,28 @@
 use std::path::PathBuf;
 
 pub fn app_data_dir() -> PathBuf {
-    kon_core::paths::app_paths().app_data_dir()
+    magnotia_core::paths::app_paths().app_data_dir()
 }
 
 /// Path to the SQLite database file.
 pub fn database_path() -> PathBuf {
-    kon_core::paths::app_paths().database_path()
+    magnotia_core::paths::app_paths().database_path()
 }
 
 /// Directory for saved audio recordings.
 pub fn recordings_dir() -> PathBuf {
-    kon_core::paths::app_paths().recordings_dir()
+    magnotia_core::paths::app_paths().recordings_dir()
 }
 
 /// Directory for crash dumps written by the Rust panic hook.
 /// Each crash is a single text file: `<unix-ts>-<short-id>.crash`.
 /// Used by the diagnostic-report bundler in Settings → About.
 pub fn crashes_dir() -> PathBuf {
-    kon_core::paths::app_paths().crashes_dir()
+    magnotia_core::paths::app_paths().crashes_dir()
 }
 
-/// Directory for the rolling Rust log file (kon.log + rotated kon.log.1, etc).
+/// Directory for the rolling Rust log file (magnotia.log + rotated magnotia.log.1, etc).
 /// Subscribers configured in src-tauri/src/lib.rs at startup.
 pub fn logs_dir() -> PathBuf {
-    kon_core::paths::app_paths().logs_dir()
+    magnotia_core::paths::app_paths().logs_dir()
 }