fix(tui): fix paste rendering for long/Unicode text

crates/openproof-core/src/apply_input.rs

@@ -103,17 +103,24 @@ impl AppState {
         }
     }
 
+    /// Threshold for collapsing paste into a marker block.
+    /// Pastes shorter than this AND single-line are inlined directly.
+    const PASTE_INLINE_MAX: usize = 120;
+
     pub(crate) fn apply_paste(&mut self, text: String) {
         if self.focus != FocusPane::Composer {
             return;
         }
-        let line_count = text.lines().count();
-        if line_count < 2 {
-            // Single-line paste: inline directly.
+        // Strip carriage returns to normalize line endings (Windows \r\n -> \n).
+        let text = text.replace('\r', "");
+        let is_multiline = text.lines().count() >= 2;
+        let is_long = text.len() > Self::PASTE_INLINE_MAX;
+        if !is_multiline && !is_long {
+            // Short single-line paste: inline directly.
             self.composer.insert_str(self.composer_cursor, &text);
             self.composer_cursor += text.len();
         } else {
-            // Multi-line paste: store as a collapsed block.
+            // Long or multi-line paste: store as a collapsed block.
             let marker_index = self.composer[..self.composer_cursor]
                 .chars()
                 .filter(|&c| c == PASTE_MARKER)

crates/openproof-tui/src/lib.rs

@@ -1046,6 +1046,12 @@ fn build_input_lines(text: &str, cursor: usize, paste_blocks: &[String]) -> Vec<
 
 /// Compute the height needed for the input area, accounting for text wrapping,
 /// newlines, and paste block display labels.
+/// Get the display width of a character, using Unicode width tables.
+/// Returns 0 for control characters, 2 for wide CJK characters, 1 for most others.
+fn char_display_width(ch: char) -> usize {
+    unicode_width::UnicodeWidthChar::width(ch).unwrap_or(0)
+}
+
 fn compute_input_height(
     text: &str,
     prefix_len: usize,
@@ -1073,10 +1079,11 @@ fn compute_input_height(
             }
             block_idx += 1;
         } else {
-            col += 1;
+            let w = char_display_width(ch);
+            col += w;
             if col >= usable {
                 visual_lines += 1;
-                col = 0;
+                col = if col > usable { w } else { 0 };
             }
         }
     }
@@ -1116,10 +1123,11 @@ fn cursor_visual_row(
             }
             block_idx += 1;
         } else {
-            col += 1;
+            let w = char_display_width(ch);
+            col += w;
             if col >= width {
                 row += 1;
-                col = 0;
+                col = if col > width { w } else { 0 };
             }
         }
     }