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/Cargo.toml

@@ -1,8 +1,8 @@
 [package]
-name = "kon-transcription"
+name = "magnotia-transcription"
 version = "0.1.0"
 edition = "2021"
-description = "Speech-to-text engine wrappers, model management, and inference concurrency for Kon"
+description = "Speech-to-text engine wrappers, model management, and inference concurrency for Magnotia"
 build = "build.rs"
 
 [features]
@@ -15,13 +15,13 @@ build = "build.rs"
 # `whisper-vulkan` is a separate feature so a non-Vulkan target (Android
 # without GPU drivers, a CPU-only Windows build) can pull in whisper-rs
 # but skip the Vulkan backend. Build CPU-only with:
-#   cargo build -p kon-transcription --no-default-features --features whisper
+#   cargo build -p magnotia-transcription --no-default-features --features whisper
 default = ["whisper", "whisper-vulkan"]
 whisper = ["dep:whisper-rs", "dep:num_cpus"]
 whisper-vulkan = ["whisper-rs?/vulkan"]
 
 [dependencies]
-kon-core = { path = "../core" }
+magnotia-core = { path = "../core" }
 
 # Parakeet via ONNX. Whisper is handled directly via whisper-rs below.
 transcribe-rs = { version = "0.3", default-features = false, features = ["onnx"] }
@@ -53,6 +53,6 @@ thiserror = "2"
 tracing = "0.1"
 
 [dev-dependencies]
-# TcpListener fixture for the download resume tests (mirrors kon-llm).
+# TcpListener fixture for the download resume tests (mirrors magnotia-llm).
 tokio = { version = "1", features = ["rt", "sync", "net", "io-util", "macros"] }
 tempfile = "3"