fix(session): skip turn_meta block when deriving session title

`SessionManager::create_saved_session_with_id_and_mode` picks the
first `ContentBlock::Text` off the user's message via `find_map`
and uses that as the session title. The engine prepends a synthetic
`<turn_meta>...</turn_meta>` block (Block 0) ahead of the real user
text (Block 1), so the `/sessions` picker was rendering the metadata
blob as the session name.

Guard the find_map filter on `!text.starts_with("<turn_meta>")` so
titles fall through to the actual user input. Existing sessions
without the prefix block are unaffected (the guard is a no-op when
no metadata block is present); the existing `truncate_title` long-
input handling continues to apply.

Harvested from PR #1498 by @wdw8276

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

CHANGELOG.md

@@ -16,6 +16,15 @@ real world uses."
 
 ### Fixed
 
+- **`/sessions` picker no longer shows `<turn_meta>` as the
+  session title** (harvested from PR #1498 by **@wdw8276**).
+  `session_manager::create_saved_session_with_id_and_mode`
+  picked the first text content block off the user message via
+  `find_map`; the engine prepends an internal `<turn_meta>` block
+  ahead of the real user text, so the picker rendered that
+  metadata blob as the session name. Guard added so titles fall
+  through to the actual user input. Existing sessions without
+  the prefix block are unaffected.
 - **Kitty keyboard protocol now activates on Windows (VSCode +
   Windows Terminal), so `Shift+Enter` inserts a newline instead
   of submitting** (#1359, harvested from PR #1483 by

crates/tui/src/session_manager.rs

@@ -674,7 +674,9 @@ pub fn create_saved_session_with_id_and_mode(
         .find(|m| m.role == "user")
         .and_then(|m| {
             m.content.iter().find_map(|block| match block {
-                ContentBlock::Text { text, .. } => Some(truncate_title(text, 50)),
+                ContentBlock::Text { text, .. } if !text.starts_with("<turn_meta>") => {
+                    Some(truncate_title(text, 50))
+                }
                 _ => None,
             })
         })