agent: lumotia-rebrand — fix QC blockers for phase 0

Phase 0 QC found two real blockers in the baseline commits:

1. crates/llm/src/lib.rs:215 — early-break guard was inverted. The
   guard fired when grammar.is_some() (where grammar already enforces
   shape, making the check redundant) and was disabled for
   grammar.is_none() (the content-tags path that actually needs it).
   Flipped to grammar.is_none() so the JSON-envelope short-circuit
   fires for free-form JSON generation as the commit message
   implied.

2. src/lib/pages/FilesPage.svelte — handleExport() success path had
   no toast, asymmetric with DictationPage which does. Added the
   toasts import and a toasts.success() call after the native save
   so both export surfaces give consistent feedback.

cargo test -p magnotia-llm --lib: 21 pass. npm run check: 0 errors.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

crates/llm/src/lib.rs

@@ -212,7 +212,7 @@ impl LlmEngine {
             generated.push_str(&piece);
             sampler.accept(next);
 
-            if config.grammar.is_some() && json_envelope_complete(&generated) {
+            if config.grammar.is_none() && json_envelope_complete(&generated) {
                 break;
             }
 

src/lib/pages/FilesPage.svelte

@@ -9,6 +9,7 @@
   import EmptyState from "$lib/components/EmptyState.svelte";
   import { exportTranscript } from "$lib/utils/export.js";
   import { hasTauriRuntime } from "$lib/utils/runtime";
+  import { toasts } from "$lib/stores/toasts.svelte.js";
   import { Upload } from 'lucide-svelte';
 
   let fileTranscript = $state("");
@@ -151,6 +152,7 @@
         });
         if (!path) return;
         await invoke("write_text_file_cmd", { path, contents: content });
+        toasts.success(`Exported ${format.toUpperCase()} transcript`);
         return;
       } catch (err) {
         console.error("file transcript export failed", err);