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/audio/src/streaming_resample.rs

@@ -27,8 +27,8 @@ use rubato::{
     Resampler, SincFixedIn, SincInterpolationParameters, SincInterpolationType, WindowFunction,
 };
 
-use kon_core::constants::WHISPER_SAMPLE_RATE;
-use kon_core::error::{KonError, Result};
+use magnotia_core::constants::WHISPER_SAMPLE_RATE;
+use magnotia_core::error::{MagnotiaError, Result};
 
 /// Number of input samples the rubato resampler consumes per `process()`
 /// call. Matches the chunk size used in `resample::resample_to_16khz`.
@@ -51,7 +51,7 @@ impl StreamingResampler {
     /// rubato rejects the requested ratio.
     pub fn new(from_rate: u32) -> Result<Self> {
         if from_rate == 0 {
-            return Err(KonError::AudioDecodeFailed(
+            return Err(MagnotiaError::AudioDecodeFailed(
                 "StreamingResampler: input sample rate is 0".into(),
             ));
         }
@@ -77,7 +77,7 @@ impl StreamingResampler {
             INPUT_CHUNK,
             1, // mono
         )
-        .map_err(|e| KonError::AudioDecodeFailed(format!("StreamingResampler init failed: {e}")))?;
+        .map_err(|e| MagnotiaError::AudioDecodeFailed(format!("StreamingResampler init failed: {e}")))?;
 
         Ok(Self::Sinc {
             resampler,
@@ -108,7 +108,7 @@ impl StreamingResampler {
                     let chunk: Vec<f32> = residual.drain(..INPUT_CHUNK).collect();
                     let input = vec![chunk];
                     let result = resampler.process(&input, None).map_err(|e| {
-                        KonError::AudioDecodeFailed(format!(
+                        MagnotiaError::AudioDecodeFailed(format!(
                             "StreamingResampler process failed: {e}"
                         ))
                     })?;
@@ -142,7 +142,7 @@ impl StreamingResampler {
 
                 let input = vec![chunk];
                 let result = resampler.process(&input, None).map_err(|e| {
-                    KonError::AudioDecodeFailed(format!("StreamingResampler flush failed: {e}"))
+                    MagnotiaError::AudioDecodeFailed(format!("StreamingResampler flush failed: {e}"))
                 })?;
 
                 let Some(mut out) = result.into_iter().next() else {