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/whisper_rs_backend.rs

@@ -10,8 +10,8 @@ use std::path::Path;
 
 use whisper_rs::{FullParams, SamplingStrategy, WhisperContext, WhisperContextParameters};
 
-use kon_core::error::{KonError, Result};
-use kon_core::types::{Segment, TranscriptionOptions};
+use magnotia_core::error::{MagnotiaError, Result};
+use magnotia_core::types::{Segment, TranscriptionOptions};
 
 use crate::transcriber::{Transcriber, TranscriberCapabilities};
 
@@ -40,7 +40,7 @@ impl WhisperRsBackend {
 impl Transcriber for WhisperRsBackend {
     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: true,
         }
@@ -63,7 +63,7 @@ impl Transcriber for WhisperRsBackend {
         );
 
         let mut state = self.ctx.create_state().map_err(|e| {
-            KonError::TranscriptionFailed(WhisperBackendError::State(e.to_string()).to_string())
+            MagnotiaError::TranscriptionFailed(WhisperBackendError::State(e.to_string()).to_string())
         })?;
 
         let mut params = FullParams::new(SamplingStrategy::Greedy { best_of: 1 });
@@ -83,7 +83,7 @@ impl Transcriber for WhisperRsBackend {
         params.set_print_realtime(false);
 
         state.full(params, samples).map_err(|e| {
-            KonError::TranscriptionFailed(
+            MagnotiaError::TranscriptionFailed(
                 WhisperBackendError::Transcribe(e.to_string()).to_string(),
             )
         })?;
@@ -98,7 +98,7 @@ impl Transcriber for WhisperRsBackend {
             let text = seg
                 .to_str()
                 .map_err(|e| {
-                    KonError::TranscriptionFailed(
+                    MagnotiaError::TranscriptionFailed(
                         WhisperBackendError::Transcribe(e.to_string()).to_string(),
                     )
                 })?