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/pages/SettingsPage.svelte

@@ -675,7 +675,7 @@
   async function testReadAloudVoice() {
     try {
       await invoke("tts_speak", {
-        text: "This is Corbie reading aloud.",
+        text: "This is Magnotia reading aloud.",
         rate: settings.ttsRate,
         voice: settings.ttsVoice ?? null,
       });
@@ -771,7 +771,7 @@
       downloadProgress = event.payload.percent || event.payload.progress || 0;
     });
 
-    unlistenLlm = await listen("kon:llm-download-progress", (event) => {
+    unlistenLlm = await listen("magnotia:llm-download-progress", (event) => {
       llmDownloadProgress = event.payload.percent || 0;
       llmDownloadingModel = event.payload.modelId || llmDownloadingModel;
     });
@@ -984,7 +984,7 @@
                   bind:value={settings.microphoneDevice}
                   onfocus={refreshAudioDevices}
                 >
-                  <option value="">Auto (recommended) — let Kon pick the working mic</option>
+                  <option value="">Auto (recommended) — let Magnotia pick the working mic</option>
                   {#each visibleAudioDevices as dev}
                     <option value={dev.name} disabled={dev.is_likely_monitor}>
                       {friendlyLabel(dev)}{#if dev.is_default && dev.name !== "default"} (system default){/if}{#if dev.is_likely_monitor} — speaker monitor, skip{/if}
@@ -1624,7 +1624,7 @@
               </div>
               <p class="text-[11px] text-text-tertiary mt-2">
                 {settings.aiTier === "off"
-                  ? "No local LLM calls. Kon falls back to the existing rule-based path."
+                  ? "No local LLM calls. Magnotia falls back to the existing rule-based path."
                   : settings.aiTier === "cleanup"
                     ? "Use the local model for transcript cleanup and formatting."
                     : "Use the local model for cleanup, task extraction, and task breakdown."}
@@ -1871,7 +1871,7 @@
                   disabled={autostartSyncing}
                   role="switch"
                   aria-checked={settings.launchAtLogin}
-                  aria-label="Launch Corbie at login"
+                  aria-label="Launch Magnotia at login"
                 >
                   <span
                     class="absolute top-[3px] left-[3px] w-4 h-4 rounded-full bg-white shadow-sm
@@ -1880,9 +1880,9 @@
                   ></span>
                 </button>
                 <div class="flex-1 min-w-0">
-                  <p class="text-[13px] text-text leading-tight">Launch Corbie at login</p>
+                  <p class="text-[13px] text-text leading-tight">Launch Magnotia at login</p>
                   <p class="text-[11px] text-text-tertiary mt-0.5 leading-snug">
-                    So Corbie is already there at the start of the day. Uses your OS's standard autostart — no background tricks.
+                    So Magnotia is already there at the start of the day. Uses your OS's standard autostart — no background tricks.
                   </p>
                   {#if autostartSyncing}
                     <p class="text-[11px] text-text-tertiary mt-1">Updating…</p>
@@ -1913,7 +1913,7 @@
         <SettingsGroup title="Nudges" description="Soft notifications, capped per hour.">
           <div class="animate-fade-in">
             <p class="text-[11px] text-text-tertiary mb-4">
-              Gentle, anticipatory reminders. Capped at 3 per hour. Never fires while you're looking at Corbie.
+              Gentle, anticipatory reminders. Capped at 3 per hour. Never fires while you're looking at Magnotia.
             </p>
 
             <Toggle
@@ -2020,13 +2020,13 @@
               />
               <Toggle
                 bind:checked={settings.transcriptionPreview}
-                label="Floating preview when Kon is unfocused"
+                label="Floating preview when Magnotia is unfocused"
                 description="Shows a small always-on-top window with the raw transcription as you dictate, then the final formatted text. Only opens when the main window is unfocused or hidden."
               />
               <Toggle
                 bind:checked={settings.meetingAutoCapture}
                 label="Remind me when a meeting starts"
-                description="Toasts when a matching app appears in the process list. You still hit the hotkey — Kon never records on its own."
+                description="Toasts when a matching app appears in the process list. You still hit the hotkey — Magnotia never records on its own."
               />
               {#if settings.meetingAutoCapture}
                 <div class="ml-[50px] mt-2 mb-1 animate-fade-in">
@@ -2201,7 +2201,7 @@
               {/each}
             </div>
 
-            <p class="text-[11px] text-text-tertiary mt-5">Kon v1.0 · Powered by whisper.cpp · Built by CORBEL Ltd</p>
+            <p class="text-[11px] text-text-tertiary mt-5">Magnotia v1.0 · Powered by whisper.cpp · Built by CORBEL Ltd</p>
 
             <!-- Diagnostic report (privacy posture: local only until you share it) -->
             <div class="mt-6 pt-5 border-t border-border-subtle">