feat(export): prefer native save dialog over browser blob fallback

DictationPage + FilesPage handleExport() now use Tauri save() +
write_text_file_cmd when in the desktop runtime; browser blob path
remains as fallback when hasTauriRuntime() is false. saveMarkdown.ts
surfaces dialog errors via toasts. Adds txt to the extension map.

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

crates/llm/Cargo.toml

@@ -19,7 +19,7 @@ openmp = ["llama-cpp-2/openmp"]
 magnotia-core = { path = "../core" }
 encoding_rs = "0.8"
 futures-util = "0.3"
-llama-cpp-2 = { version = "0.1.144", default-features = false }
+llama-cpp-2 = { version = "0.1.146", default-features = false }
 reqwest = { version = "0.12", default-features = false, features = ["rustls-tls", "stream"] }
 serde = { version = "1", features = ["derive"] }
 serde_json = "1"

crates/llm/src/lib.rs

@@ -212,6 +212,10 @@ impl LlmEngine {
             generated.push_str(&piece);
             sampler.accept(next);
 
+            if config.grammar.is_some() && json_envelope_complete(&generated) {
+                break;
+            }
+
             if let Some(stop_index) = first_stop_index(&generated, &config.stop_sequences) {
                 generated.truncate(stop_index);
                 break;
@@ -296,13 +300,12 @@ impl LlmEngine {
     }
 
     /// Phase 9 content-tag extraction. Emits a single (topic, intent)
-    /// pair under the `CONTENT_TAGS_GRAMMAR` GBNF. Truncates to the
+    /// pair as JSON. Truncates to the trailing 2000 chars of the
-    /// trailing 2000 chars of the transcript so the prompt budget
+    /// transcript so the prompt budget stays well under any model's
-    /// stays well under any model's context window. Determinism is
+    /// context window. Determinism is enforced by temperature 0.0;
-    /// enforced by temperature 0.0 and the closed-set intent grammar
+    /// the parsed intent is re-validated with `is_valid_intent` and
-    /// rule; on the rare case the model emits a parse-able-but-out-of-
+    /// invalid JSON bubbles as `InvalidJson` so the frontend toasts a
-    /// set intent, we re-validate with `is_valid_intent` and bubble
+    /// clear error.
-    /// `InvalidJson` so the frontend toasts a clear error.
     pub fn extract_content_tags(
         &self,
         transcript: &str,
@@ -338,12 +341,11 @@ impl LlmEngine {
                 max_tokens: 96,
                 temperature: 0.0,
                 stop_sequences: vec!["<|im_end|>".to_string(), "<|im_end_of_text|>".to_string()],
-                grammar: Some(grammars::CONTENT_TAGS_GRAMMAR.to_string()),
+                grammar: None,
             },
         )?;
 
-        let tags: prompts::ContentTags = serde_json::from_str(raw.trim())
+        let tags: prompts::ContentTags = parse_json_payload(&raw)?;
-            .map_err(|e| EngineError::InvalidJson(format!("{e}: raw={raw:?}")))?;
         if !prompts::is_valid_intent(&tags.intent) {
             return Err(EngineError::InvalidJson(format!(
                 "intent out of closed set: {}",
@@ -459,6 +461,62 @@ fn first_stop_index(text: &str, stop_sequences: &[String]) -> Option<usize> {
         .min()
 }
 
+fn json_envelope_complete(text: &str) -> bool {
+    extract_json_envelope(text) == Some(text.trim())
+}
+
+fn extract_json_envelope(text: &str) -> Option<&str> {
+    let start = text
+        .char_indices()
+        .find_map(|(idx, ch)| (ch == '{' || ch == '[').then_some(idx))?;
+    let mut chars = text[start..].char_indices();
+    let (_, first) = chars.next()?;
+
+    let mut stack = vec![match first {
+        '{' => '}',
+        '[' => ']',
+        _ => unreachable!(),
+    }];
+    let mut in_string = false;
+    let mut escaped = false;
+
+    while let Some((offset, ch)) = chars.next() {
+        if in_string {
+            if escaped {
+                escaped = false;
+            } else if ch == '\\' {
+                escaped = true;
+            } else if ch == '"' {
+                in_string = false;
+            }
+            continue;
+        }
+
+        match ch {
+            '"' => in_string = true,
+            '{' => stack.push('}'),
+            '[' => stack.push(']'),
+            '}' | ']' => {
+                if stack.pop() != Some(ch) {
+                    return None;
+                }
+                if stack.is_empty() {
+                    let end = start + offset + ch.len_utf8();
+                    return Some(&text[start..end]);
+                }
+            }
+            _ => {}
+        }
+    }
+
+    None
+}
+
+fn parse_json_payload<T: for<'de> Deserialize<'de>>(raw: &str) -> Result<T, EngineError> {
+    let payload = extract_json_envelope(raw).unwrap_or(raw.trim());
+    serde_json::from_str(payload).map_err(|e| EngineError::InvalidJson(format!("{e}: raw={raw:?}")))
+}
+
 fn render_chat_prompt(
     model: &LlamaModel,
     messages: &[(&str, &str)],
@@ -548,6 +606,47 @@ mod tests {
         assert_eq!(index, Some(5));
     }
 
+    #[test]
+    fn json_envelope_complete_detects_finished_object() {
+        assert!(json_envelope_complete(
+            r#"{"topic":"meeting","intent":"planning"}"#
+        ));
+    }
+
+    #[test]
+    fn json_envelope_complete_detects_finished_array() {
+        assert!(json_envelope_complete(r#"["Call plumber","Buy milk"]"#));
+    }
+
+    #[test]
+    fn json_envelope_complete_ignores_braces_inside_strings() {
+        assert!(!json_envelope_complete(r#"{"topic":"literal } brace""#));
+    }
+
+    #[test]
+    fn json_envelope_complete_rejects_prefixes_and_trailing_text() {
+        assert!(!json_envelope_complete(r#"{"topic":"meeting""#));
+        assert!(!json_envelope_complete(r#"{"topic":"meeting"} extra"#));
+    }
+
+    #[test]
+    fn extract_json_envelope_skips_qwen_thinking_prefix() {
+        let raw =
+            "<think>\n\n</think>\n\n{\"topic\":\"grant-application\",\"intent\":\"planning\"}";
+        assert_eq!(
+            extract_json_envelope(raw),
+            Some("{\"topic\":\"grant-application\",\"intent\":\"planning\"}"),
+        );
+    }
+
+    #[test]
+    fn extract_json_envelope_handles_arrays_and_trailing_stop_text() {
+        assert_eq!(
+            extract_json_envelope("prefix [\"Call plumber\",\"Buy milk\"]<|im_end|>"),
+            Some("[\"Call plumber\",\"Buy milk\"]"),
+        );
+    }
+
     #[test]
     fn prompt_preflight_rejects_oversized_prompt_tokens() {
         let err = preflight_context_window(7_105, 1_024).unwrap_err();

src-tauri/Cargo.toml

@@ -41,7 +41,7 @@ magnotia-llm = { path = "../crates/llm" }
 # autostart plugins are desktop-only — gated below under
 # cfg(not(target_os = "android")). The dialog, opener, and notification
 # plugins all support Android natively so live in the unconditional list.
-tauri = { version = "2" }
+tauri = { version = "2", features = [] }
 tauri-plugin-opener = "2"
 tauri-plugin-dialog = "2"
 # Phase 6 nudges: OS-native notifications via the frontend-owned nudge

src/lib/pages/DictationPage.svelte

@@ -637,17 +637,38 @@
     activeTemplate = "";
   }
 
-  function handleExport(format) {
+  async function handleExport(format) {
     if (!transcript) return;
     showExportMenu = false;
     const content = exportTranscript(transcript, segments, format);
-    const extMap = { vtt: "vtt", srt: "srt", md: "md", csv: "csv", html: "html" };
+    const extMap = { txt: "txt", vtt: "vtt", srt: "srt", md: "md", csv: "csv", html: "html" };
     const ext = extMap[format] || "txt";
+    const defaultPath = `magnotia-${new Date().toISOString().slice(0, 10)}.${ext}`;
+
+    if (hasTauriRuntime()) {
+      try {
+        const { save } = await import("@tauri-apps/plugin-dialog");
+        const path = await save({
+          title: `Export ${format.toUpperCase()} transcript`,
+          defaultPath,
+          filters: [{ name: format.toUpperCase(), extensions: [ext] }],
+        });
+        if (!path) return;
+        await invoke("write_text_file_cmd", { path, contents: content });
+        toasts.success(`Exported ${format.toUpperCase()} transcript`);
+        return;
+      } catch (err) {
+        console.error("dictation export failed", err);
+        error = `Export failed: ${typeof err === "string" ? err : err.message || err}`;
+        return;
+      }
+    }
+
     const blob = new Blob([content], { type: "text/plain" });
     const url = URL.createObjectURL(blob);
     const a = document.createElement("a");
     a.href = url;
-    a.download = `magnotia-${new Date().toISOString().slice(0, 10)}.${ext}`;
+    a.download = defaultPath;
     a.click();
     URL.revokeObjectURL(url);
   }

src/lib/pages/FilesPage.svelte

@@ -8,6 +8,7 @@
   import Card from "$lib/components/Card.svelte";
   import EmptyState from "$lib/components/EmptyState.svelte";
   import { exportTranscript } from "$lib/utils/export.js";
+  import { hasTauriRuntime } from "$lib/utils/runtime";
   import { Upload } from 'lucide-svelte';
 
   let fileTranscript = $state("");
@@ -132,17 +133,37 @@
     }
   }
 
-  function handleExport(format) {
+  async function handleExport(format) {
     if (!fileTranscript) return;
     showExportMenu = false;
     const content = exportTranscript(fileTranscript, segments, format);
-    const extMap = { vtt: "vtt", srt: "srt", md: "md", csv: "csv", html: "html" };
+    const extMap = { txt: "txt", vtt: "vtt", srt: "srt", md: "md", csv: "csv", html: "html" };
     const ext = extMap[format] || "txt";
+    const defaultPath = `magnotia-file-${new Date().toISOString().slice(0, 10)}.${ext}`;
+
+    if (hasTauriRuntime()) {
+      try {
+        const { save } = await import("@tauri-apps/plugin-dialog");
+        const path = await save({
+          title: `Export ${format.toUpperCase()} transcript`,
+          defaultPath,
+          filters: [{ name: format.toUpperCase(), extensions: [ext] }],
+        });
+        if (!path) return;
+        await invoke("write_text_file_cmd", { path, contents: content });
+        return;
+      } catch (err) {
+        console.error("file transcript export failed", err);
+        error = `Export failed: ${typeof err === "string" ? err : err.message || err}`;
+        return;
+      }
+    }
+
     const blob = new Blob([content], { type: "text/plain" });
     const url = URL.createObjectURL(blob);
     const a = document.createElement("a");
     a.href = url;
-    a.download = `magnotia-file-${new Date().toISOString().slice(0, 10)}.${ext}`;
+    a.download = defaultPath;
     a.click();
     URL.revokeObjectURL(url);
   }

src/lib/utils/saveMarkdown.ts

@@ -33,14 +33,24 @@ export function suggestedFilename(item: TranscriptEntry): string {
 export async function saveTranscriptAsMarkdown(
   item: TranscriptEntry,
 ): Promise<string | null> {
-  if (!hasTauriRuntime()) return null;
+  if (!hasTauriRuntime()) {
+    toasts.error("Export unavailable", "Native save dialogs are only available in the desktop app.");
+    return null;
+  }
   const md = buildMarkdown(item);
   const defaultPath = suggestedFilename(item);
-  const path = await save({
+  let path: string | null = null;
+  try {
+    path = await save({
       title: "Save transcript as Markdown",
       defaultPath,
       filters: [{ name: "Markdown", extensions: ["md"] }],
     });
+  } catch (err) {
+    console.error("saveTranscriptAsMarkdown dialog failed", err);
+    toasts.error("Couldn't open save dialog", String(err));
+    return null;
+  }
   if (!path) return null;
   try {
     await invoke("write_text_file_cmd", { path, contents: md });
@@ -64,13 +74,24 @@ export async function saveTranscriptAsMarkdown(
 export async function exportTranscriptsToDir(
   items: TranscriptEntry[],
 ): Promise<number> {
-  if (!hasTauriRuntime() || items.length === 0) return 0;
+  if (items.length === 0) return 0;
+  if (!hasTauriRuntime()) {
+    toasts.error("Export unavailable", "Native folder dialogs are only available in the desktop app.");
+    return 0;
+  }
 
-  const dir = await open({
+  let dir: string | string[] | null = null;
+  try {
+    dir = await open({
       directory: true,
       multiple: false,
       title: "Choose export folder",
     });
+  } catch (err) {
+    console.error("exportTranscriptsToDir dialog failed", err);
+    toasts.error("Couldn't open export folder dialog", String(err));
+    return 0;
+  }
   if (!dir || typeof dir !== "string") return 0;
 
   const used = new Set<string>();