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/llm/src/prompts.rs

@@ -45,9 +45,9 @@ context that are not explicit commitments. Output an empty array if there are \
 no action items.";
 
 /// Compact representation of a human-in-the-loop feedback example used
-/// for few-shot prompt conditioning. Built by kon-storage and fed to the
+/// for few-shot prompt conditioning. Built by magnotia-storage and fed to the
 /// prompt builder below; we keep this struct local to the LLM crate so
-/// kon-llm does not depend on kon-storage.
+/// magnotia-llm does not depend on magnotia-storage.
 #[derive(Debug, Clone)]
 pub struct FeedbackExample {
     /// What the AI was given as input (e.g. the parent task text, or