fix(site): enlarge checkbox click target in workspace and task tables (#24739)

Fixes a UX issue where clicking near (but not exactly on) the
bulk-action
checkbox in the Workspaces or Tasks table would navigate to the
workspace/task page instead of toggling the checkbox. Clicking back then
clears all previous selections.

## Changes

Wraps each row checkbox in a `div` that:
- Calls `e.stopPropagation()` on `click` and `keydown` so near-miss
  clicks toggle the checkbox instead of navigating.
- Uses `h-[72px]` to fill the full row height for vertical coverage.
- Uses `pr-4 -mr-4` to extend the safe zone to the right without
  shifting layout.
- Sets `cursor-default` so the pointer hand does not appear in the
  safe zone.

Applied to both:
- `WorkspacesTable.tsx` (workspaces page)
- `TasksTable.tsx` (tasks page)

> This PR was authored by Coder Agents.

site/src/pages/TasksPage/TasksTable.tsx

@@ -221,17 +221,27 @@ const TaskRow: FC<TaskRowProps> = ({ task, checked, onCheckChange }) => {
 			>
 				<TableCell>
 					<div className="flex items-center gap-5">
-						<Checkbox
-							data-testid={`checkbox-${task.id}`}
-							checked={checked}
-							onClick={(e) => {
-								e.stopPropagation();
+						{/* Wrap the checkbox in a click-absorbing container
+						 * so that near-miss clicks do not bubble up to the
+						 * row's navigation handler. */}
+						<div
+							className="flex items-center cursor-default h-[72px] pr-4 -mr-4"
+							onClick={(e) => e.stopPropagation()}
+							onKeyDown={(e) => {
+								if (e.key === "Enter" || e.key === " ") {
+									e.stopPropagation();
+								}
 							}}
-							onCheckedChange={(checked) => {
-								onCheckChange(task.id, Boolean(checked));
-							}}
-							aria-label={`Select task ${task.initial_prompt}`}
-						/>
+						>
+							<Checkbox
+								data-testid={`checkbox-${task.id}`}
+								checked={checked}
+								onCheckedChange={(checked) => {
+									onCheckChange(task.id, Boolean(checked));
+								}}
+								aria-label={`Select task ${task.initial_prompt}`}
+							/>
+						</div>
 						<AvatarData
 							title={
 								<span className="block max-w-[520px] truncate">

site/src/pages/WorkspacesPage/WorkspacesTable.tsx

@@ -185,26 +185,36 @@ export const WorkspacesTable: FC<WorkspacesTableProps> = ({
 						>
 							<TableCell>
 								<div className="flex items-center gap-5">
-									<Checkbox
-										data-testid={`checkbox-${workspace.id}`}
-										disabled={cantBeChecked(workspace)}
-										checked={checked}
-										onClick={(e) => {
-											e.stopPropagation();
-										}}
-										onCheckedChange={(checked) => {
-											if (checked) {
-												onCheckChange([...checkedWorkspaces, workspace]);
-											} else {
-												onCheckChange(
-													checkedWorkspaces.filter(
-														(w) => w.id !== workspace.id,
-													),
-												);
+									{/* Wrap the checkbox in a click-absorbing container
+									 * so that near-miss clicks do not bubble up to the
+									 * row's navigation handler. */}
+									<div
+										className="flex items-center cursor-default h-[72px] pr-4 -mr-4"
+										onClick={(e) => e.stopPropagation()}
+										onKeyDown={(e) => {
+											if (e.key === "Enter" || e.key === " ") {
+												e.stopPropagation();
 											}
 										}}
-										aria-label={`Select workspace ${workspace.name}`}
-									/>
+									>
+										<Checkbox
+											data-testid={`checkbox-${workspace.id}`}
+											disabled={cantBeChecked(workspace)}
+											checked={checked}
+											onCheckedChange={(checked) => {
+												if (checked) {
+													onCheckChange([...checkedWorkspaces, workspace]);
+												} else {
+													onCheckChange(
+														checkedWorkspaces.filter(
+															(w) => w.id !== workspace.id,
+														),
+													);
+												}
+											}}
+											aria-label={`Select workspace ${workspace.name}`}
+										/>
+									</div>
 									<AvatarData
 										title={
 											<div className="flex items-center gap-1">