fix(output): respect terminal width and truncate long project paths

Replace hardcoded FALLBACK_WIDTH=200 with ContentArrangement::Dynamic
so comfy-table auto-fits to the actual terminal. Truncate project paths
to the last ~40 chars with an ellipsis prefix in sessions list.

Closes claudbg-6dgc

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

.beans/claudbg-6dgc--table-overflows-terminal-truncate-long-columns-and.md

@@ -1,11 +1,11 @@
 ---
 # claudbg-6dgc
 title: Table overflows terminal — truncate long columns and respect terminal width
-status: todo
+status: completed
 type: bug
 priority: normal
 created_at: 2026-03-30T04:36:31Z
-updated_at: 2026-03-30T04:41:14Z
+updated_at: 2026-03-30T05:06:58Z
 parent: claudbg-tci9
 ---
 
@@ -28,3 +28,8 @@ parent: claudbg-tci9
 
 - `src/output/table.rs` — `render_table`, `FALLBACK_WIDTH` constant
 - `src/commands/sessions.rs` — `list()` function that calls `render_table`
+
+## Summary of Changes
+
+- Removed hardcoded FALLBACK_WIDTH=200 from table.rs; table now uses ContentArrangement::Dynamic for automatic terminal width fitting
+- In sessions list(), truncate project path to last ~40 chars with ellipsis prefix when longer

src/commands/sessions.rs

@@ -189,10 +189,23 @@ pub async fn list(opts: &crate::cli::GlobalOpts) -> Result<()> {
             crate::util::short_id(&session_id).to_string()
         };
 
+        const MAX_PATH_LEN: usize = 40;
+        let display_path = if project_path.len() > MAX_PATH_LEN {
+            let boundary = project_path
+                .char_indices()
+                .rev()
+                .map(|(i, _)| i)
+                .nth(MAX_PATH_LEN - 1)
+                .unwrap_or(0);
+            format!("…{}", &project_path[boundary..])
+        } else {
+            project_path
+        };
+
         rows.push(vec![
             display_id,
             last_msg_at,
-            project_path,
+            display_path,
             model,
             message_count.to_string(),
         ]);

src/output/table.rs

@@ -12,12 +12,6 @@ use crate::error::Result;
 pub fn render_table(headers: &[&str], rows: &[Vec<String>]) -> Result<String> {
     let mut table = Table::new();
     table.set_content_arrangement(ContentArrangement::Dynamic);
-    // Ensure a sensible minimum width so content is never truncated in non-interactive
-    // environments (CI, Nix sandbox, pipes) where the terminal may report a very narrow
-    // width or no width at all.
-    const FALLBACK_WIDTH: u16 = 200;
-    let width = table.width().unwrap_or(FALLBACK_WIDTH).max(FALLBACK_WIDTH);
-    table.set_width(width);
     table.set_header(headers);
     for row in rows {
         table.add_row(row);