Add Match Row and Delete Row commands

Match Row: selects all rows where the cell in the current column
equals the current cell's value. Selection spans first-to-last
matching row across all columns.

Delete Row (Cmd+Backspace): deletes every row in the current
selection, or the single current row if nothing is selected.
Ensures at least one empty row always remains.

Co-authored-by: Shelley <shelley@exe.dev>

app_test.go

@@ -98,7 +98,7 @@ func TestParseCSVString(t *testing.T) {
 func TestGetCommands(t *testing.T) {
 	reg := NewCommandRegistry()
 	cmds := reg.GetCommands()
-	if len(cmds) != 15 {
+	if len(cmds) != 17 {
 		t.Errorf("expected 12 commands, got %d", len(cmds))
 	}
 	// Check that all have IDs

commands.go

@@ -33,5 +33,7 @@ func (c *CommandRegistry) GetCommands() []Command {
 		{ID: "sort-asc", Name: "Sort A-Z", Shortcut: ""},
 		{ID: "sort-desc", Name: "Sort Z-A", Shortcut: ""},
 		{ID: "sort-advanced", Name: "Sort Advanced", Shortcut: ""},
+		{ID: "match-row", Name: "Match Row", Shortcut: ""},
+		{ID: "delete-row", Name: "Delete Row", Shortcut: "Cmd+Backspace"},
 	}
 }

frontend/src/main.js

@@ -491,6 +491,13 @@ document.addEventListener('keydown', (e) => {
         return;
     }
 
+    // Cmd+Backspace deletes rows
+    if (meta && e.key === 'Backspace') {
+        e.preventDefault();
+        executeCommand('delete-row');
+        return;
+    }
+
     // Delete/Backspace clears selected cells
     if (e.key === 'Delete' || e.key === 'Backspace') {
         e.preventDefault();
@@ -615,6 +622,8 @@ async function loadCommands() {
             { ID: 'sort-asc', Name: 'Sort A-Z', Shortcut: '' },
             { ID: 'sort-desc', Name: 'Sort Z-A', Shortcut: '' },
             { ID: 'sort-advanced', Name: 'Sort Advanced', Shortcut: '' },
+            { ID: 'match-row', Name: 'Match Row', Shortcut: '' },
+            { ID: 'delete-row', Name: 'Delete Row', Shortcut: 'Cmd+Backspace' },
         ];
     }
 }
@@ -720,6 +729,8 @@ async function executeCommand(id) {
         case 'sort-asc': doSort(true); break;
         case 'sort-desc': doSort(false); break;
         case 'sort-advanced': openSortAdvanced(); break;
+        case 'match-row': doMatchRow(); break;
+        case 'delete-row': doDeleteRow(); break;
     }
 }
 
@@ -933,6 +944,59 @@ function doInsertColRight() {
     setStatus('Inserted column right');
 }
 
+// ===== Match & Delete Row =====
+function doMatchRow() {
+    const col = state.cursor.col;
+    const val = getCellValue(state.cursor.row, col);
+    const matchingRows = [];
+    for (let r = 0; r < state.rows.length; r++) {
+        if ((state.rows[r][col] || '') === val) {
+            matchingRows.push(r);
+        }
+    }
+    if (matchingRows.length === 0) {
+        setStatus('No matching rows');
+        return;
+    }
+    // Select from first to last matching row, spanning all columns
+    const first = matchingRows[0];
+    const last = matchingRows[matchingRows.length - 1];
+    state.cursor = { row: first, col: 0 };
+    state.selection = {
+        startRow: first,
+        startCol: 0,
+        endRow: last,
+        endCol: state.headers.length - 1,
+    };
+    updateSelectionClasses();
+    scrollCursorIntoView();
+    const colName = state.headers[col] || colLabel(col);
+    setStatus(`${matchingRows.length} row(s) matching ${colName} = "${val}"`);
+}
+
+function doDeleteRow() {
+    const sel = normalizeSelection();
+    let startRow, endRow;
+    if (sel) {
+        startRow = sel.r1;
+        endRow = sel.r2;
+    } else {
+        startRow = state.cursor.row;
+        endRow = state.cursor.row;
+    }
+    const count = endRow - startRow + 1;
+    state.rows.splice(startRow, count);
+    // Ensure at least one row remains
+    if (state.rows.length === 0) {
+        state.rows.push(new Array(state.headers.length).fill(''));
+    }
+    // Adjust cursor
+    state.cursor.row = Math.min(startRow, state.rows.length - 1);
+    state.selection = null;
+    render();
+    setStatus(`Deleted ${count} row(s)`);
+}
+
 // ===== Sorting =====
 function doSort(ascending) {
     const col = state.cursor.col;