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/lib/stores/page.svelte.ts

@@ -36,10 +36,10 @@ export const page = $state<PageState>({
   taskSidebarOpen: false,
 });
 
-const SETTINGS_KEY = "kon_settings";
-const PROFILES_KEY = "kon_profiles";
-const TASK_LISTS_KEY = "kon_task_lists";
-const TEMPLATES_KEY = "kon_templates";
+const SETTINGS_KEY = "magnotia_settings";
+const PROFILES_KEY = "magnotia_profiles";
+const TASK_LISTS_KEY = "magnotia_task_lists";
+const TEMPLATES_KEY = "magnotia_templates";
 
 const defaults: SettingsState = {
   engine: "whisper",
@@ -102,8 +102,8 @@ function loadSettings(): SettingsState {
     queueMicrotask(() => {
       toasts.warn(
         "Settings reset",
-        "Your saved settings couldn't be read, so Kon fell back to defaults. "
-          + "Earlier Kon builds can still read your old data.",
+        "Your saved settings couldn't be read, so Magnotia fell back to defaults. "
+          + "Earlier Magnotia builds can still read your old data.",
       );
     });
   }
@@ -117,7 +117,7 @@ export const settings = $state<SettingsState>(loadSettings());
 
 export function saveSettings() {
   if (!canUseStorage()) return;
-  // Versioned envelope {version, data}. Older Kon builds that used
+  // Versioned envelope {version, data}. Older Magnotia builds that used
   // the bare-object layout can still spread the `data` key over
   // their defaults — they will just silently drop fields they don't
   // know about, which is the same behaviour as today.
@@ -459,7 +459,7 @@ export async function deleteTask(id: string) {
       tasks.splice(idx, 1);
       broadcastTasks();
       if (typeof window !== "undefined") {
-        window.dispatchEvent(new CustomEvent("kon:task-deleted", { detail: { id } }));
+        window.dispatchEvent(new CustomEvent("magnotia:task-deleted", { detail: { id } }));
       }
     }
   } catch (err) {
@@ -477,7 +477,7 @@ export async function completeTask(id: string) {
     // to this to clear micro-step-idle timers for the completed task
     // and, later, to drive Phase 7 "after a task completes" rules.
     if (typeof window !== "undefined") {
-      window.dispatchEvent(new CustomEvent("kon:task-completed", { detail: { id } }));
+      window.dispatchEvent(new CustomEvent("magnotia:task-completed", { detail: { id } }));
     }
   } catch (err) {
     toasts.error("Couldn't complete task", errorMessage(err));
@@ -491,7 +491,7 @@ export async function uncompleteTask(id: string) {
     await invoke("uncomplete_task_cmd", { id });
     applyLocalTaskUpdate(id, { done: false, doneAt: null });
     if (typeof window !== "undefined") {
-      window.dispatchEvent(new CustomEvent("kon:task-uncompleted", { detail: { id } }));
+      window.dispatchEvent(new CustomEvent("magnotia:task-uncompleted", { detail: { id } }));
     }
   } catch (err) {
     toasts.error("Couldn't uncomplete task", errorMessage(err));
@@ -504,7 +504,7 @@ interface TaskChannelMessage {
 }
 
 const taskChannel = typeof BroadcastChannel !== "undefined"
-  ? new BroadcastChannel("kon_task_sync")
+  ? new BroadcastChannel("magnotia_task_sync")
   : null;
 
 if (taskChannel) {
@@ -654,7 +654,7 @@ interface TaskListChannelMessage {
 }
 
 const taskListChannel = typeof BroadcastChannel !== "undefined"
-  ? new BroadcastChannel("kon_task_lists")
+  ? new BroadcastChannel("magnotia_task_lists")
   : null;
 
 if (taskListChannel) {