feat(ui): add new edge/jump commands and keymap

Introduced new commands: JumpToEdge (first/last row/col), PageScroll, and
OpenRecordRow. Updated command registry to use these commands and unified
key handling. Added format module for formatting functions. Updated main.rs
to include format module. Updated keymap to bind new commands and page
scroll.

Co-Authored-By: fiddlerwoaroof/git-smart-commit (bartowski/nvidia_Nemotron-Cascade-2-30B-A3B-GGUF)

src/command/keymap.rs

@@ -266,10 +266,14 @@ impl KeymapSet {
         normal.bind(KeyCode::Char('G'), none, "jump-last-row");
         normal.bind(KeyCode::Char('0'), none, "jump-first-col");
         normal.bind(KeyCode::Char('$'), none, "jump-last-col");
+        normal.bind(KeyCode::Home, none, "jump-first-col");
+        normal.bind(KeyCode::End, none, "jump-last-col");
 
         // Scroll
         normal.bind_args(KeyCode::Char('d'), ctrl, "scroll-rows", vec!["5".into()]);
         normal.bind_args(KeyCode::Char('u'), ctrl, "scroll-rows", vec!["-5".into()]);
+        normal.bind_args(KeyCode::PageDown, none, "page-scroll", vec!["1".into()]);
+        normal.bind_args(KeyCode::PageUp, none, "page-scroll", vec!["-1".into()]);
 
         // Cell operations
         normal.bind(KeyCode::Char('x'), none, "clear-cell");
@@ -357,7 +361,7 @@ impl KeymapSet {
         // Drill into aggregated cell / view history / add row
         normal.bind(KeyCode::Char('>'), none, "drill-into-cell");
         normal.bind(KeyCode::Char('<'), none, "view-back");
-        normal.bind(KeyCode::Char('o'), none, "add-record-row");
+        normal.bind(KeyCode::Char('o'), none, "open-record-row");
 
         // Records mode toggle and prune toggle
         normal.bind(KeyCode::Char('R'), none, "toggle-records-mode");
@@ -560,6 +564,7 @@ impl KeymapSet {
         let mut ed = Keymap::new();
         ed.bind_args(KeyCode::Esc, none, "enter-mode", vec!["normal".into()]);
         ed.bind(KeyCode::Enter, none, "commit-cell-edit");
+        ed.bind(KeyCode::Tab, none, "commit-and-advance-right");
         ed.bind_args(KeyCode::Backspace, none, "pop-char", vec!["edit".into()]);
         ed.bind_any_char("append-char", vec!["edit".into()]);
         set.insert(ModeKey::Editing, Arc::new(ed));

src/format.rs

@@ -0,0 +1,50 @@
+use crate::model::cell::CellValue;
+
+/// Format a CellValue for display with number formatting options.
+pub fn format_value(v: Option<&CellValue>, comma: bool, decimals: u8) -> String {
+    match v {
+        Some(CellValue::Number(n)) => format_f64(*n, comma, decimals),
+        Some(CellValue::Text(s)) => s.clone(),
+        None => String::new(),
+    }
+}
+
+/// Parse a number format string like ",.0" into (use_commas, decimal_places).
+pub fn parse_number_format(fmt: &str) -> (bool, u8) {
+    let comma = fmt.contains(',');
+    let decimals = fmt
+        .rfind('.')
+        .and_then(|i| fmt[i + 1..].parse::<u8>().ok())
+        .unwrap_or(0);
+    (comma, decimals)
+}
+
+/// Format an f64 with optional comma grouping and decimal places.
+pub fn format_f64(n: f64, comma: bool, decimals: u8) -> String {
+    let formatted = format!("{:.prec$}", n, prec = decimals as usize);
+    if !comma {
+        return formatted;
+    }
+    let (int_part, dec_part) = if let Some(dot) = formatted.find('.') {
+        (&formatted[..dot], Some(&formatted[dot..]))
+    } else {
+        (&formatted[..], None)
+    };
+    let is_neg = int_part.starts_with('-');
+    let digits = if is_neg { &int_part[1..] } else { int_part };
+    let mut result = String::new();
+    for (idx, c) in digits.chars().rev().enumerate() {
+        if idx > 0 && idx % 3 == 0 {
+            result.push(',');
+        }
+        result.push(c);
+    }
+    if is_neg {
+        result.push('-');
+    }
+    let mut out: String = result.chars().rev().collect();
+    if let Some(dec) = dec_part {
+        out.push_str(dec);
+    }
+    out
+}

src/main.rs

@@ -1,5 +1,6 @@
 mod command;
 mod draw;
+mod format;
 mod formula;
 mod import;
 mod model;