standardise on --label; add label filter and display to pr list/view

- rename --hashtag (comma-separated) to --label (repeatable) on issue list,
  matching the --label flag already used on issue create
- add --label filter to pr list with the same OR semantics (matching GitHub)
- display labels column in pr list table and Labels: line in pr view
- include labels array in all JSON outputs (list and view for both issue and pr)
- rename internal 'hashtags' -> 'labels' throughout issue_list.rs and list.rs

1 files changed, 9 insertions, 4 deletions

diff --git a/src/bin/ngit/cli.rs b/src/bin/ngit/cli.rs
index 0599b51..5ee9165 100644
--- a/src/bin/ngit/cli.rs
+++ b/src/bin/ngit/cli.rs
@@ -177,6 +177,10 @@ pub enum PrCommands {
         /// Filter by status (comma-separated: open,draft,closed,applied)
         #[arg(long, default_value = "open,draft")]
         status: String,
+        /// Filter by label (repeatable, OR logic: --label bug --label
+        /// help-wanted)
+        #[arg(long = "label", value_name = "LABEL")]
+        labels: Vec<String>,
         /// Output as JSON
         #[arg(long)]
         json: bool,
@@ -311,9 +315,10 @@ pub enum IssueCommands {
         /// Filter by status (comma-separated: open,draft,closed,applied)
         #[arg(long, default_value = "open")]
         status: String,
-        /// Filter by hashtag/label (comma-separated)
-        #[arg(long)]
-        hashtag: Option<String>,
+        /// Filter by label (repeatable, OR logic: --label bug --label
+        /// help-wanted)
+        #[arg(long = "label", value_name = "LABEL")]
+        labels: Vec<String>,
         /// Output as JSON
         #[arg(long)]
         json: bool,
@@ -347,7 +352,7 @@ pub enum IssueCommands {
         /// Issue body / description
         #[arg(long)]
         body: Option<String>,
-        /// Hashtag labels (repeatable: --label bug --label help-wanted)
+        /// Labels to apply (repeatable: --label bug --label help-wanted)
         #[arg(long = "label", value_name = "LABEL")]
         labels: Vec<String>,
     },