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/transcripts.rs

@@ -1,4 +1,4 @@
-// Tauri commands wrapping the kon_storage transcript CRUD.
+// Tauri commands wrapping the magnotia_storage transcript CRUD.
 // These are the bridge that lets the Svelte frontend treat SQLite as the
 // canonical store rather than localStorage.
 //
@@ -13,7 +13,7 @@
 
 use serde::{Deserialize, Serialize};
 
-use kon_storage::{
+use magnotia_storage::{
     count_transcripts, delete_transcript as db_delete_transcript,
     get_transcript as db_get_transcript, insert_transcript as db_insert_transcript,
     list_transcripts_paged, search_transcripts as db_search_transcripts,
@@ -29,7 +29,7 @@ use crate::AppState;
 ///
 /// Task 2.5 — `starred`, `manualTags`, `template`, `language`, `segmentsJson`
 /// were added to back the viewer metadata that previously lived only in the
-/// removed `kon_history` localStorage cache.
+/// removed `magnotia_history` localStorage cache.
 #[derive(Debug, Clone, Serialize)]
 #[serde(rename_all = "camelCase")]
 pub struct TranscriptDto {
@@ -111,7 +111,7 @@ pub async fn add_transcript(
         profile_id: transcript
             .profile_id
             .as_deref()
-            .unwrap_or(kon_storage::DEFAULT_PROFILE_ID),
+            .unwrap_or(magnotia_storage::DEFAULT_PROFILE_ID),
         title: transcript.title.as_deref(),
         audio_path: transcript.audio_path.as_deref(),
         duration: transcript.duration,