fix(show): include gitlab_id on notes in issue/MR detail views

The show command's NoteDetail and MrNoteDetail structs were missing
gitlab_id, making individual notes unaddressable in robot mode output.
This was inconsistent with the notes list command which already exposed
gitlab_id. Without an identifier, agents consuming show output could
not construct GitLab web URLs or reference specific notes for follow-up
operations via glab.

Added gitlab_id to:
- NoteDetail / NoteDetailJson (issue discussions)
- MrNoteDetail / MrNoteDetailJson (MR discussions)
- Both SQL queries (shifted column indices accordingly)
- Both From<&T> conversion impls

Deliberately scoped to show command only — me/timeline/trace structs
were evaluated and intentionally left unchanged because they serve
different consumption patterns where note-level identity is not needed.

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

src/cli/commands/show/issue.rs

@@ -44,6 +44,7 @@ pub struct DiscussionDetail {
 
 #[derive(Debug, Serialize)]
 pub struct NoteDetail {
+    pub gitlab_id: i64,
     pub author_username: String,
     pub body: String,
     pub created_at: i64,
@@ -277,7 +278,7 @@ fn get_issue_discussions(conn: &Connection, issue_id: i64) -> Result<Vec<Discuss
         .collect::<std::result::Result<Vec<_>, _>>()?;
 
     let mut note_stmt = conn.prepare(
-        "SELECT author_username, body, created_at, is_system
+        "SELECT gitlab_id, author_username, body, created_at, is_system
          FROM notes
          WHERE discussion_id = ?
          ORDER BY position",
@@ -287,11 +288,12 @@ fn get_issue_discussions(conn: &Connection, issue_id: i64) -> Result<Vec<Discuss
     for (disc_id, individual_note) in disc_rows {
         let notes: Vec<NoteDetail> = note_stmt
             .query_map([disc_id], |row| {
-                let is_system: i64 = row.get(3)?;
+                let is_system: i64 = row.get(4)?;
                 Ok(NoteDetail {
-                    author_username: row.get(0)?,
-                    body: row.get(1)?,
-                    created_at: row.get(2)?,
+                    gitlab_id: row.get(0)?,
+                    author_username: row.get(1)?,
+                    body: row.get(2)?,
+                    created_at: row.get(3)?,
                     is_system: is_system == 1,
                 })
             })?

src/cli/commands/show/mr.rs

@@ -29,6 +29,7 @@ pub struct MrDiscussionDetail {
 
 #[derive(Debug, Serialize)]
 pub struct MrNoteDetail {
+    pub gitlab_id: i64,
     pub author_username: String,
     pub body: String,
     pub created_at: i64,
@@ -224,7 +225,7 @@ fn get_mr_discussions(conn: &Connection, mr_id: i64) -> Result<Vec<MrDiscussionD
         .collect::<std::result::Result<Vec<_>, _>>()?;
 
     let mut note_stmt = conn.prepare(
-        "SELECT author_username, body, created_at, is_system,
+        "SELECT gitlab_id, author_username, body, created_at, is_system,
                 position_old_path, position_new_path, position_old_line,
                 position_new_line, position_type
          FROM notes
@@ -236,12 +237,12 @@ fn get_mr_discussions(conn: &Connection, mr_id: i64) -> Result<Vec<MrDiscussionD
     for (disc_id, individual_note) in disc_rows {
         let notes: Vec<MrNoteDetail> = note_stmt
             .query_map([disc_id], |row| {
-                let is_system: i64 = row.get(3)?;
-                let old_path: Option<String> = row.get(4)?;
-                let new_path: Option<String> = row.get(5)?;
-                let old_line: Option<i64> = row.get(6)?;
-                let new_line: Option<i64> = row.get(7)?;
-                let position_type: Option<String> = row.get(8)?;
+                let is_system: i64 = row.get(4)?;
+                let old_path: Option<String> = row.get(5)?;
+                let new_path: Option<String> = row.get(6)?;
+                let old_line: Option<i64> = row.get(7)?;
+                let new_line: Option<i64> = row.get(8)?;
+                let position_type: Option<String> = row.get(9)?;
 
                 let position = if old_path.is_some()
                     || new_path.is_some()
@@ -260,9 +261,10 @@ fn get_mr_discussions(conn: &Connection, mr_id: i64) -> Result<Vec<MrDiscussionD
                 };
 
                 Ok(MrNoteDetail {
-                    author_username: row.get(0)?,
-                    body: row.get(1)?,
-                    created_at: row.get(2)?,
+                    gitlab_id: row.get(0)?,
+                    author_username: row.get(1)?,
+                    body: row.get(2)?,
+                    created_at: row.get(3)?,
                     is_system: is_system == 1,
                     position,
                 })

src/cli/commands/show/render.rs

@@ -398,6 +398,7 @@ pub struct DiscussionDetailJson {
 
 #[derive(Serialize)]
 pub struct NoteDetailJson {
+    pub gitlab_id: i64,
     pub author_username: String,
     pub body: String,
     pub created_at: String,
@@ -458,6 +459,7 @@ impl From<&DiscussionDetail> for DiscussionDetailJson {
 impl From<&NoteDetail> for NoteDetailJson {
     fn from(note: &NoteDetail) -> Self {
         Self {
+            gitlab_id: note.gitlab_id,
             author_username: note.author_username.clone(),
             body: note.body.clone(),
             created_at: ms_to_iso(note.created_at),
@@ -497,6 +499,7 @@ pub struct MrDiscussionDetailJson {
 
 #[derive(Serialize)]
 pub struct MrNoteDetailJson {
+    pub gitlab_id: i64,
     pub author_username: String,
     pub body: String,
     pub created_at: String,
@@ -542,6 +545,7 @@ impl From<&MrDiscussionDetail> for MrDiscussionDetailJson {
 impl From<&MrNoteDetail> for MrNoteDetailJson {
     fn from(note: &MrNoteDetail) -> Self {
         Self {
+            gitlab_id: note.gitlab_id,
             author_username: note.author_username.clone(),
             body: note.body.clone(),
             created_at: ms_to_iso(note.created_at),