Implement core speech-to-text pipeline

All major components: hotkey listener (rdev), audio capture (cpal),
resampling (rubato), VAD (Silero ONNX), Parakeet v3 TDT transcription
(ort), overlay window (winit+softbuffer), paste simulation (enigo+arboard),
audio feedback (rodio), YAML config, CLI with clap, HuggingFace model
download. ~2400 lines of Rust across 16 source files.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

src/paste.rs

@@ -0,0 +1,71 @@
+use anyhow::{Context, Result};
+use arboard::Clipboard;
+use enigo::{Direction, Enigo, Key, Keyboard, Settings};
+use std::thread;
+use std::time::Duration;
+use tracing::{debug, info};
+
+use crate::config::PasteMethod;
+
+/// Paste text using the configured method.
+pub fn paste_text(text: &str, method: &PasteMethod, keep_on_clipboard: bool) -> Result<()> {
+    let mut clipboard = Clipboard::new().context("Failed to open clipboard")?;
+
+    // Save current clipboard content if we need to restore it
+    let previous = if !keep_on_clipboard {
+        clipboard.get_text().ok()
+    } else {
+        None
+    };
+
+    // Set text to clipboard
+    clipboard
+        .set_text(text.to_string())
+        .context("Failed to set clipboard text")?;
+    debug!("Text set to clipboard ({} chars)", text.len());
+
+    if *method == PasteMethod::ClipboardOnly {
+        info!("Text copied to clipboard (clipboard_only mode)");
+        return Ok(());
+    }
+
+    // Small delay to ensure clipboard is ready
+    thread::sleep(Duration::from_millis(50));
+
+    // Simulate paste keystroke
+    let mut enigo = Enigo::new(&Settings::default()).context("Failed to create enigo instance")?;
+
+    match method {
+        PasteMethod::CtrlV => {
+            debug!("Pasting via Ctrl+V");
+            enigo.key(Key::Control, Direction::Press)?;
+            enigo.key(Key::Unicode('v'), Direction::Click)?;
+            enigo.key(Key::Control, Direction::Release)?;
+        }
+        PasteMethod::ShiftInsert => {
+            debug!("Pasting via Shift+Insert");
+            enigo.key(Key::Shift, Direction::Press)?;
+            enigo.key(Key::Other(0x2D), Direction::Click)?; // VK_INSERT on Windows
+            enigo.key(Key::Shift, Direction::Release)?;
+        }
+        PasteMethod::CtrlShiftV => {
+            debug!("Pasting via Ctrl+Shift+V");
+            enigo.key(Key::Control, Direction::Press)?;
+            enigo.key(Key::Shift, Direction::Press)?;
+            enigo.key(Key::Unicode('v'), Direction::Click)?;
+            enigo.key(Key::Shift, Direction::Release)?;
+            enigo.key(Key::Control, Direction::Release)?;
+        }
+        PasteMethod::ClipboardOnly => unreachable!(),
+    }
+
+    // Restore previous clipboard content if needed
+    if let Some(prev) = previous {
+        thread::sleep(Duration::from_millis(100));
+        let _ = clipboard.set_text(prev);
+        debug!("Previous clipboard content restored");
+    }
+
+    info!("Text pasted ({} chars)", text.len());
+    Ok(())
+}