feat(native): taskbar progress bar during uploads (#10)

`set_taskbar_progress(status, progress)` drives Tauri's window progress
bar (Windows taskbar button; launcher/dock elsewhere where supported):
none / normal (0-100) / indeterminate / error. Uses Tauri's built-in
ITaskbarList3 wrapper rather than more hand-written COM.

Bump cinny (the aggregation, throttling and error hold).

Closes #10

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01PPmy3tPq869XDW4njjVaKA

src-tauri/src/lib.rs

@@ -701,6 +701,34 @@ fn set_tray_update_ready(app: tauri::AppHandle, version: Option<String>) -> Resu
     Ok(())
 }
 
+/// cinny-desktop #10: upload progress on the taskbar button (Windows taskbar;
+/// the launcher/dock elsewhere, where Tauri supports it). `status` is `none`,
+/// `normal`, `indeterminate` or `error`; `progress` is 0-100. The web side
+/// aggregates every upload and throttles calls to ~4 Hz.
+#[tauri::command]
+fn set_taskbar_progress(
+    app: tauri::AppHandle,
+    status: String,
+    progress: Option<u64>,
+) -> Result<(), String> {
+    use tauri::window::{ProgressBarState, ProgressBarStatus};
+    let status = match status.as_str() {
+        "normal" => ProgressBarStatus::Normal,
+        "indeterminate" => ProgressBarStatus::Indeterminate,
+        "error" => ProgressBarStatus::Error,
+        _ => ProgressBarStatus::None,
+    };
+    let window = app
+        .get_webview_window("main")
+        .ok_or_else(|| "no main window".to_string())?;
+    window
+        .set_progress_bar(ProgressBarState {
+            status: Some(status),
+            progress: progress.map(|p| p.min(100)),
+        })
+        .map_err(|e| e.to_string())
+}
+
 /// Flash the taskbar button to draw attention (e.g. a new mention while the
 /// window is unfocused). Clears automatically once the window is focused.
 #[tauri::command]
@@ -750,6 +778,7 @@ pub fn run() {
             get_tray_dnd,
             set_tray_update_ready,
             set_tray_call_state,
+            set_taskbar_progress,
             flash_window,
             focus_main_window,
             send_notification,