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/mcp/Cargo.toml

@@ -1,18 +1,18 @@
 [package]
-name = "kon-mcp"
+name = "magnotia-mcp"
 version = "0.1.0"
 edition = "2021"
-description = "Read-only MCP stdio server exposing Kon transcripts and tasks to external agents"
+description = "Read-only MCP stdio server exposing Magnotia transcripts and tasks to external agents"
 
 [[bin]]
-name = "kon-mcp"
+name = "magnotia-mcp"
 path = "src/main.rs"
 
 [lib]
 path = "src/lib.rs"
 
 [dependencies]
-kon-storage = { path = "../storage" }
+magnotia-storage = { path = "../storage" }
 sqlx = { version = "0.8", default-features = false, features = ["runtime-tokio", "sqlite"] }
 serde = { version = "1", features = ["derive"] }
 serde_json = "1"