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/transcription/src/local_engine.rs

@@ -4,8 +4,8 @@ use std::time::Instant;
 
 use transcribe_rs::{SpeechModel, TranscribeOptions, TranscriptionResult};
 
-use kon_core::error::{KonError, Result};
-use kon_core::types::{
+use magnotia_core::error::{MagnotiaError, Result};
+use magnotia_core::types::{
     AudioSamples, EngineName, ModelId, Segment, Transcript, TranscriptionOptions,
 };
 
@@ -28,7 +28,7 @@ pub struct SpeechModelAdapter(pub Box<dyn SpeechModel + Send>);
 impl Transcriber for SpeechModelAdapter {
     fn capabilities(&self) -> TranscriberCapabilities {
         TranscriberCapabilities {
-            sample_rate: kon_core::constants::WHISPER_SAMPLE_RATE,
+            sample_rate: magnotia_core::constants::WHISPER_SAMPLE_RATE,
             channels: 1,
             supports_initial_prompt: false,
         }
@@ -48,7 +48,7 @@ impl Transcriber for SpeechModelAdapter {
         let result: TranscriptionResult = self
             .0
             .transcribe(samples, &opts)
-            .map_err(|e| KonError::TranscriptionFailed(e.to_string()))?;
+            .map_err(|e| MagnotiaError::TranscriptionFailed(e.to_string()))?;
         Ok(result
             .segments
             .unwrap_or_default()
@@ -140,7 +140,7 @@ impl LocalEngine {
         options: &TranscriptionOptions,
     ) -> Result<TimedTranscript> {
         let mut guard = self.engine.lock().unwrap_or_else(|e| e.into_inner());
-        let backend = guard.as_mut().ok_or(KonError::EngineNotLoaded)?;
+        let backend = guard.as_mut().ok_or(MagnotiaError::EngineNotLoaded)?;
 
         let start = Instant::now();
         let segments = backend.transcribe_sync(audio.samples(), options)?;
@@ -160,7 +160,7 @@ impl LocalEngine {
 /// Thin wrapper over `ParakeetModel` that overrides `transcribe_raw` to
 /// request word-granularity segments. `transcribe-rs` 0.3's trait impl for
 /// `ParakeetModel::transcribe_raw` ignores `TranscribeOptions` and uses
-/// `TimestampGranularity::Token` (per-subword) — which surfaces in Kon as
+/// `TimestampGranularity::Token` (per-subword) — which surfaces in Magnotia as
 /// "T Est Ing . One , Two , Three" output. The concrete-type method
 /// `ParakeetModel::transcribe_with` accepts `ParakeetParams` with an
 /// explicit granularity; this wrapper exposes that to the trait object.
@@ -197,7 +197,7 @@ impl transcribe_rs::SpeechModel for ParakeetWordGranularity {
 pub fn load_parakeet(model_dir: &Path) -> Result<Box<dyn Transcriber + Send>> {
     use transcribe_rs::onnx::Quantization;
     let model = transcribe_rs::onnx::parakeet::ParakeetModel::load(model_dir, &Quantization::Int8)
-        .map_err(|e| KonError::TranscriptionFailed(format!("Failed to load Parakeet: {e}")))?;
+        .map_err(|e| MagnotiaError::TranscriptionFailed(format!("Failed to load Parakeet: {e}")))?;
     Ok(Box::new(SpeechModelAdapter(Box::new(
         ParakeetWordGranularity(model),
     ))))
@@ -207,7 +207,7 @@ pub fn load_parakeet(model_dir: &Path) -> Result<Box<dyn Transcriber + Send>> {
 #[cfg(feature = "whisper")]
 pub fn load_whisper(model_path: &Path) -> Result<Box<dyn Transcriber + Send>> {
     let backend = WhisperRsBackend::load(model_path)
-        .map_err(|e| KonError::TranscriptionFailed(format!("Failed to load Whisper: {e}")))?;
+        .map_err(|e| MagnotiaError::TranscriptionFailed(format!("Failed to load Whisper: {e}")))?;
     Ok(Box::new(backend))
 }