feat: redesign auto-approval pill with server-level grouping and batch toggle

Group MCP tools by server and LSP tools by profile in the approval popover
instead of showing a flat list. Each server/profile group gets a collapsible
header with a batch toggle to approve/unapprove all tools at once. Add a
search filter (visible when >10 tools) and partial-state indicators for
groups with mixed approval. Add groupApprovalToolsByProvider shared helper
with tests.

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

src/renderer/components/ChatPane.tsx

@@ -484,6 +484,7 @@ export function ChatPane({
                   effectiveAutoApprovedCount={effectiveAutoApprovedCount}
                   isOverridden={isApprovalOverridden}
                   onUpdate={onUpdateSessionApprovalSettings}
+                  toolingSettings={toolingSettings}
                 />
               )}
               {primaryAgent && (
@@ -539,6 +540,7 @@ export function ChatPane({
                   effectiveAutoApprovedCount={effectiveAutoApprovedCount}
                   isOverridden={isApprovalOverridden}
                   onUpdate={onUpdateSessionApprovalSettings}
+                  toolingSettings={toolingSettings}
                 />
               )}
             </div>