feat: Phase 2 — missed call queue, login redesign, button fix

- Missed call queue with FIFO auto-assignment, dedup, SLA tracking
- Status sub-tabs (Pending/Attempted/Completed/Invalid) in worklist
- missedCallId passed through disposition flow for callback tracking
- Login page redesigned: centered white card on blue background
- Disposition button changed to content-width
- NavAccountCard popover close fix on menu item click

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

src/components/call-desk/disposition-form.tsx

@@ -94,19 +94,21 @@ export const DispositionForm = ({ onSubmit, defaultDisposition }: DispositionFor
                 rows={3}
             />
 
-            <button
-                type="button"
-                onClick={handleSubmit}
-                disabled={selected === null}
-                className={cx(
-                    'w-full rounded-xl py-3 text-sm font-semibold transition duration-100 ease-linear',
-                    selected !== null
-                        ? 'cursor-pointer bg-brand-solid text-white hover:bg-brand-solid_hover'
-                        : 'cursor-not-allowed bg-disabled text-disabled',
-                )}
-            >
-                Save & Close Call
-            </button>
+            <div className="flex justify-end">
+                <button
+                    type="button"
+                    onClick={handleSubmit}
+                    disabled={selected === null}
+                    className={cx(
+                        'rounded-xl px-6 py-2.5 text-sm font-semibold transition duration-100 ease-linear',
+                        selected !== null
+                            ? 'cursor-pointer bg-brand-solid text-white hover:bg-brand-solid_hover'
+                            : 'cursor-not-allowed bg-disabled text-disabled',
+                    )}
+                >
+                    Save & Close Call
+                </button>
+            </div>
         </div>
     );
 };